Use your "BACK" button to return to Imperial Valley Quake report.
17:15 PST Sunday, December 28
The Diamond Bar earthquake just mentioned was followed at 5:03 pm by a ML3.2 at the same location.
Both quakes were widely felt between about Pasadena and Riverside, and into Orange County.
--------------------------------------------------------------------------------
16:54 PST Sunday, December 28
At 4:49 pm this afternoon, a ML3.5 quake occurred 2 miles south-southwest of Diamond Bar.
We don't have many "felt reports" yet, but we know it was felt as far as Pasadena.
--------------------------------------------------------------------------------
11:52 PST Friday, December 26
Two small quakes were felt overnight in the Inland Empire region: a ML2.8 at 9:54 pm & a ML2.9 at 3:00 am.
Both quake occurred 4 mi. south-southwest of Devore, or 5 miles north-northeast of Fontana.
Felt reports came from San Bernardino, Rialto, Fontana, Rancho Cucamonga, Riverside & Colton.
--------------------------------------------------------------------------------
16:31 PST Thursday, December 25
We have recorded and located 227 earthquakes in the last week. Click here to see a summary and a map.
Although you can see the southeastern end of the San Simeon aftershock sequence on the map, these total
only inludes Southern California earthquakes.
--------------------------------------------------------------------------------
10:08 PST Wednesday, December 24
The earthquake of 9:42 am today (12/24) was not a San Simeon aftershock. It was located 3 miles north-northwest of
Vandenberg Air Force Base, near Lompoc. Magnitude was ML3.7. It is being reported felt at Vandenberg AFB & also in
Lompoc, Santa Maria, Paso Robles & even Santa Barbara.
--------------------------------------------------------------------------------
16:51 PST Tuesday, December 23
There was an update today from the U.S.G.S. in Menlo Park, indicating that surface rupture was found
on the Oceanic fault. This makes it the probably culprit for the Mw6.5. Aftershocks continue.
The largest so far is still the Mw4.7 that happened 11 minutes after the mainshock.
--------------------------------------------------------------------------------
13:36 PST Monday, December 22
Late this morning (11:15 and 56 seconds), Central California experienced a Mw 6.5 earthquake.
The epicenter was located 7 miles northeast of San Simeon. This is within the Northern California
Seismic Network, operated by the U.S. Geological Survey out of Menlo Park. Our colleagues there
report that the aftershocks are indicating a unilateral fault rupture to the southeast, with a fault
length of possibly up to 15 or 20 miles. The Oceanic fault (which is actually on land, not offshore)
is at the moment considered a likely culprit. It is one of a series of thrust faults located between
strike-slip faults, themselves parallel to the San Andreas fault, which is about 35 miles to the northeast.
Today's earthquake was clearly felt as far away as the Bay area and Orange County, with a few reports
from south of Oceanside. The town of Lockwood reported intensity Modified Mercalli VIII.
Paso Robles & Shandon have reported intensity VII. These levels of shaking can easily cause damage
to older structures. It is reported that two deaths occured as a result of a collapsed Clock Tower in Paso Robles.
Many feelable aftershocks are to be expected. The U.S.G.S. aftershock warning indicates a 90% chance
of a M5.0 or larger aftershock within the next week. The chances of a bigger quake are, of course, much smaller.
The usual chance that any quake in California is a foreshock is 5% or 1 out of 20. Since it has been
nearly three hours since the mainshock & no larger quake has happened, this risk is probably now down
in the 2 to 3% level.
Also of possibly some interest was a ML4.1 earthquake on Saturday, in the remote mountains 24 miles east of Big Pine,
in the northern Owens Valley. The time was 8:35 am on Saturday. It was reported lightly felt in Bishop, Big Pine,
Independence, Lone Pine & surrounding areas.
--------------------------------------------------------------------------------
07:31 PST Friday, December 19
Early this morning, there was a ML3.0 quake near the intersection of the Banning & San Jacinto faults,
3 miles southeast of Loma Linda. The time was 3:45 am & the quake was reported felt throughout the
Riverside & San Bernardino areas.
--------------------------------------------------------------------------------
16:29 PST Thursday, December 18
We have recorded and located 206 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:25 PST Monday, December 15
A small quake on Saturday was reported felt in Rancho Cucamonga.
The quake was a ML2.7, located 6 miles north-northeast of Ranch Cucamonga.
The time was 10:46 am on Saturday.
--------------------------------------------------------------------------------
07:52 PST Friday, December 12
There was a small quake at 8:42 pm last night, located 4 miles south-southeast of Palomar
Observatory, or 18 miles northeast of Escondido.
It was reported felt in Escondido, Valley Center & Ramona. The magnitude was ML2.7.
--------------------------------------------------------------------------------
16:18 PST Thursday, December 11
We have recorded and located 270 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
10:02 PST Thursday, December 11
At 9:33 am this morning, a ML3.5 quake occurred in Mexico, 33 miles south of Calexico.
We have no reports yet, but it is probable that this quake was felt in the Imperial Valley area.
--------------------------------------------------------------------------------
07:41 PST Wednesday, December 10
A ML2.8 quake yesterday afternoon might have been felt in the northern Imperial Valley.
The time was 4:41 pm & the earthquake was located at the southern end of the Salton Sea, 1 miles
west-southwest of Obsidian Butte.
--------------------------------------------------------------------------------
07:32 PST Tuesday, December 09
Between 3:45 & 4:00 pm yesterday, a series of probable sonic booms were reported as felt
earthquakes from Santa Barbara to the San Fernando Valley.
--------------------------------------------------------------------------------
09:34 PST Saturday, December 06
Another earthquake near the San Jacinto fault zone occurred this morning, this time 1 mile
west-southwest of San Bernardino. The time was 5:50 am & the magnitude was ML3.4.
This quake was reported felt throughout the Inland Empire.
--------------------------------------------------------------------------------
12:04 PST Friday, December 05
There was a ML3.0 quake this morning, at 11:01 am, in the San Jacinto fault zone 10 miles
north-northeast of Borrego Springs. It probably was felt in Borrego Springs, but we don't have any reports yet.
--------------------------------------------------------------------------------
16:29 PST Thursday, December 04
We have recorded and located 157 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
10:35 PST Thursday, December 04
At 10:15 pm last night, there was a ML3.7 quake located 6 miles east of Ridgecrest.
It was reported felt in the town of Ridgecrest, Trona & Caliente (near Lake Isabella).
There was also a ML3.0 at 12:25 am today, located in the Little San Bernardino Mtns. 16 miles
northeast of Mecca, or 16 miles north of North Shore. We don't have any felt reports on that quake, as of right now.
--------------------------------------------------------------------------------
07:42 PST Sunday, November 30
Two quakes occurred this morning 6 miles east of Ojai. This first was a ML2.5 at 7:06 am & the other was
a ML3.1 at 7:29 am. The second one, at least, was reported felt in Ojai.
--------------------------------------------------------------------------------
13:35 PST Friday, November 28
Early this morning, at 6:16 am, there was a ML2.9 quake close to the Elsinore fault zone,
5 miles west-northwest of Palomar Observatory, or about 10 miles north-northeast of Valley Center.
It was reported felt in Valley Center, Escondido, Pine Valley, Hemet, San Marcos & other nearby communities.
--------------------------------------------------------------------------------
16:52 PST Thursday, November 27
We have recorded and located 125 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
06:52 PST Thursday, November 27
There was a ML3.5 quake this morning at 6:38 am, located in the hills 6 miles north-northeast of Indio,
or 20 miles east of Palm Springs. We do have some reports that it was felt in the surrounding towns.
--------------------------------------------------------------------------------
11:14 PST Wednesday, November 26
We just had another very small but felt earthquake. It was a ML2.0 at 9:54 am, located 6 miles east of Ojai.
It was reported felt in Camarillo.
--------------------------------------------------------------------------------
07:27 PST Wednesday, November 26
This morning at 6:53 am, there was a ML3.0 quake offshore 23 miles west of La Jolla.
There is no reason why this quake would not have been felt in the San Diego area, but we have no reports so far.
--------------------------------------------------------------------------------
10:06 PST Tuesday, November 25
A small quake was felt at 9:22 am this morning, in Mira Loma, Norco, Corona, Chino Hills & Rancho Cucamonga.
The epicenter was 3 miles northwest of Mira Loma & the magnitude was ML2.5.
--------------------------------------------------------------------------------
09:24 PST Monday, November 24
At 7:06 pm on Saturday, there was a ML3.1 located in the hills 8 miles east of Coachella.
It was reported felt in La Quinta & Palm Springs.
--------------------------------------------------------------------------------
16:36 PST Thursday, November 20
We have recorded and located 110 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
15:23 PST Wednesday, November 19
There was a ML3.0 at 10:39 am this morning, located offshore 38 miles west-southwest of
Rosarita, Mexico. It might have been felt in San Diego; we got one report.
--------------------------------------------------------------------------------
16:20 PST Thursday, November 13
We have recorded and located 165 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:03 PST Thursday, November 13
A M3.3 quake last night in the Borrego Springs area was reported felt.
The quake occurred at 9:17 pm & was located in Coyote Canyon 8 miles north-northwest of Borrego Springs.
There were "felt reports" from as far away as Escondido, San Diego & Rancho Mirage.
Peak intensity was Modified Mercalli III.
--------------------------------------------------------------------------------
13:15 PST Wednesday, November 12
We just had another "felt" quake: a ML3.3 in the San Gorgonio Pass area at 12:23 pm, located 2 miles
south of Banning. It was felt in the Banning & Beaumont areas, in Palm Springs & in San Bernardino.
The peak intensity is Modified Mercalli IV. The focal mechanism is strike-slip.
--------------------------------------------------------------------------------
08:09 PST Wednesday, November 12
We had a small quake in the Inland Empire at 6:12 pm last night, magnitude ML2.7.
The epicenter was 12 miles northeast of Yucaipa along Mill Creek.
The quake was reported felt in Yucaipa & surrounding communities.
--------------------------------------------------------------------------------
08:05 PST Tuesday, November 11
The Northern California Seismic Network reported a M3.5 quake in northern Owens Valley at 6:07 pm last night.
The epicenter was located in the Round Valley area, 12 miles west-northwest of Bishop.
There were reports that the quake was felt in Bishop.
In Southern California, a very small quake (M2.0) was reported felt at 6:07 am this morning.
This epicenter was located 2 miles northeast of Obsidian Butte & the felt report came from Calipatria.
--------------------------------------------------------------------------------
08:07 PST Monday, November 10
Early Saturday morning (2:37 am), a M2.8 quake was felt in the Lake Isabella area. The epicenter was 4 miles
north-northeast of the town of Lake Isabella. We did get a few reports that it was felt in Lake Isabella & Weldon.
--------------------------------------------------------------------------------
16:35 PST Thursday, November 06
We have recorded and located 158 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:41 PST Thursday, November 06
This small quake was felt in Placentia: ML2.4 at 7:29 am this morning, located 3 miles north-northeast of Yorba Linda.
--------------------------------------------------------------------------------
15:53 PST Wednesday, November 05
A small quake, magnitude M2.8, was felt this afternoon in the Claremont, Upland & La Verne areas.
The epicenter was located 5 miles north of Claremont & the time was 2:44 pm.
--------------------------------------------------------------------------------
09:59 PST Sunday, November 02
Early Saturday morning, at 6:52 am, there was a M3.3 located in the Bakersfield area: 8 miles south
of Weedpatch (sic), or 8 miles southwest of Arvin. For some reason, we don't have any reports that
it was felt, although it probably was.
Another M3.3 Saturday night was felt, however. This quake occurred at 7:59 pm & was located 4 miles
south of Devore. This is close to the intersection of the San Jacinto & the Cucamonga fault zones.
This quake was felt throughout the Inland Empire with a peak intensity of Modified Mercalli IV.
It was preceded by a M1.8 & a M2.6 foreshock, the latter of which was initially reported as another M3.3.
This error was due to the two quakes being only 19 seconds apart in time, causing the magnitude software to
include some waves from the second quake into its calculations for the first.
The Seismic Network staff were very happy to learn yesterday that many (not all) of the recording stations
we thought were lost to the fires are actually okay, just without power!
--------------------------------------------------------------------------------
07:20 PST Friday, October 31
Yesterday at 5:07 pm, there was a M2.9 quake located 3 miles northwest of Malibu.
This quake was originally reported as a M3.0; actually the final result was M2.94, so a slight
increase in the number of readings used for the magnitude got it rounded down instead of up.
Whatever the magnitude, the quake was felt in the Calabasas, Agoura Hills areas, Westlake Village,
Thousand Oaks & nearby communities. The peak intensity was Modified Mercally III.
--------------------------------------------------------------------------------
16:12 PST Thursday, October 30
We have recorded and located 153 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:51 PST Thursday, October 30
There was another in Simi Valley at 5:50 am this morning, a magnitude M2.6. It occurred about 1 mile
north-northwest of Simi Valley & was felt in Simi Valley. There have been 6 quakes in this series, the largest
one of course being the M3.6 yesterday.
We also saw a M2.7 this morning, under the southeastern end of the Salton Sea, 3 miles north-northeast
of Obsidian Butte. This area is part of the Brawley Seismic Zone, which is a common source of small earthquakes.
The time on today's quake was 7:03 am.
--------------------------------------------------------------------------------
16:18 PST Wednesday, October 29
At 3:44 pm today, there was a M3.7 about 1 mile north of Simi Valley, in the same location
where the earlier quakes occurred today. There have been more than 900 (and growing) "felt reports"
on the CIIM website ("Did You Feel It?" link above), indicating a peak intensity of Modified Mercalli IV
in Simi Valley. The quake was felt as far away as Pasadena, the Santa Monica area & Castaic.
--------------------------------------------------------------------------------
10:29 PST Wednesday, October 29
We had another small quake this morning: a M2.8 under Simi Valley. It was felt in the Simi Valley & Thousand Oaks area.
The time was 8:36 am this morning. Between the Hector Mines quake last night & this one, we are getting a pretty
good survey of which of our seismic stations are still working.
--------------------------------------------------------------------------------
08:28 PST Wednesday, October 29
There was a M3.0 Hector Mines quake at 11:18 pm last night. The epicenter was located 9 miles west-southwest of Ludlow.
The quake was probably not felt, due to its remote location.
--------------------------------------------------------------------------------
09:19 PDT Friday, October 24
There was a M3.1 early this morning near Ocotillo Wells, west of the Imperial Valley.
The time was 3:11 am & the epicenter was located in the complex San Jacinto fault zone
14 miles east-southeast of Ocotillo Wells. The ShakeMap indicates that the peak instrumental
intensity should have been about Modified Mercalli III near the southwestern shore of the Salton Sea,
but we have not received any actual "felt reports" yet.
--------------------------------------------------------------------------------
17:06 PDT Thursday, October 23
We have recorded and located 202 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
15:17 PDT Wednesday, October 22
There was a M3.5 quake in northern Baja late yesterday afternoon. It was located 27 miles south-southeast
of Calexico & took place at 5:04 pm. The quake was felt in El Centro.
--------------------------------------------------------------------------------
07:53 PDT Monday, October 20
Very early Saturday morning (12:27 am & 12:38 am), there was a pair of M3.4's in the
Pismo Beach/San Luis Obispo area. The epicenters were located 10 miles southwest of San Luis Obispo.
The quakes were reported felt in the San Luis Obispo area, Santa Maria & Lompoc.
We also had a M2.7 9 miles east of Coso Junction on Saturday morning.
The time was 7:13 am. It was accompanied by about half a dozen smaller quakes, all in the M1 range.
--------------------------------------------------------------------------------
17:10 PDT Thursday, October 17
We have recorded and located 148 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:01 PDT Wednesday, October 15
We had another Landers aftershock last night, this time a M3.4. It occurred at 9:18 pm & was
located 6 miles south-southeast of Yucca Valley, near the southern end of the Landers (July 1992 Mw7.3) rupture zone.
It was reported felt by 191 people in 25 zip codes in the High Desert & Inland Empire.
--------------------------------------------------------------------------------
12:58 PDT Friday, October 10
There was a M3.5 Landers aftershock last night, at 7:27 pm. It was located 8 miles north of Yucca Valley.
There were 37 felt reports from Yucca Valley, Landers, Desert Hot Springs & Morongo Valley.
--------------------------------------------------------------------------------
17:21 PDT Thursday, October 09
We have recorded and located 195 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
08:56 PDT Thursday, October 09
We had a felt quake in the Anza-Borrego area overnight. The time was 12:33 am & the epicenter
was located in the complex San Jacinto fault zone, 11 miles north of Borrego Springs.
It was reported felt in Borrego Springs, La Quinta & Palm Springs.
--------------------------------------------------------------------------------
09:39 PDT Wednesday, October 08
There was a M4.3 quake this morning in northern Baja (Mexico), that was felt in El Centro & Mexicali.
The time was 4:26 am & the epicenter was located 35 miles south of Calexico.
--------------------------------------------------------------------------------
12:44 PDT Tuesday, October 07
A M3.6 quake was widely felt this morning in the San Diego area & as far north as Solano Beach & Escondido.
The time was 10:35 am & the epicenter was located 5 miles west-southwest of San Ysidro.
Peak intensity reported was Modified Mercalli III.
--------------------------------------------------------------------------------
12:50 PDT Sunday, October 05
There was a M2.9 at 4:47 am this morning, located 5 miles north-northwest of Simi Valley.
It was felt widely in the San Fernando Valley, through the Newbury Park/Camarillo area,
Agora Hills, and as far away as West Los Angeles.
--------------------------------------------------------------------------------
13:51 PDT Saturday, October 04
A M3.0 earthquake shook the area 5 miles north-northwest of Ocotillo wells at 12:26 pm today.
We've received no reports of it being felt.
--------------------------------------------------------------------------------
09:34 PDT Friday, October 03
A potentially "feelable" earthquake occurred early this morning; a M2.7 locate 3 miles
north-northeast of Big Bear City. We received no official report that it disturbed someone's sound sleep.
--------------------------------------------------------------------------------
17:10 PDT Thursday, October 02
We have recorded and located 185 earthquakes in the last week.
--------------------------------------------------------------------------------
17:26 PDT Thursday, September 25
We have recorded and located 182 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
17:14 PDT Thursday, September 18
We have recorded and located 157 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:42 PDT Thursday, September 18
At 5:51 pm yesterday, there was a very small quake M2.2 in the South Bay area, 2 miles north of Carson.
It was reported felt in Torrance.
--------------------------------------------------------------------------------
07:40 PDT Monday, September 15
Several earthquakes of feelable size occurred over the weekend:
First, there was a M3.4 at 5:59 pm on Friday, located 5 miles north-northwest of Simi Valley.
It was felt widely in the Simi Valley, western San Fernando Valley, and the Thousand Oaks/Newbury
Park area, as far south as El Segundo & as far east as Glendale. Peak intensity was Modified Mercalli level III.
There was also a M2.9 at 1:23 am on Saturday, located 19 miles south of Taft, or 31 miles
west of Frazier Park. We would not expect to get "felt reports" on this quake, due to its remote location.
Another possible feelable quake occurred at 7:32 pm on Saturday. It was a M3.0, located
11 miles east-northeast of Indio. It might have been felt in Indio or Mecca, but we have no reports.
Another M3.0 occurred at 5:20 pm on Sunday, this time 2 miles east-northeast of Obsidian Butte,
in the northern Imperial Valley. This quake would have been noticable in Westmorland/Calipatria area.
--------------------------------------------------------------------------------
17:15 PDT Thursday, September 11
We have recorded and located 193 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
13:02 PDT Thursday, September 11
There appears to be a small earthquake swarm developing just south of the U.S./Mexico border,
near the Imperial Valley. The largest so far was a M3.7 at 10:03 am this morning.
It was felt in Calexico & El Centro, also in Yuma AZ.
--------------------------------------------------------------------------------
10:17 PDT Wednesday, September 10
There was a M3.1 in the Clark Lake area, in the San Jacinto fault zone 4 miles north of Borrego
Springs, this morning. The time was 8:27 am. As far as we know, it was not felt.
--------------------------------------------------------------------------------
17:24 PDT Thursday, September 04
We have recorded and located 191 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
17:14 PDT Thursday, August 28
We have recorded and located 197 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:38 PDT Wednesday, August 27
There were more "felt" quakes in the Valencia area late last night. The largest was
a M3.9 at 11:02 pm, located 5 miles west of Valencia. It was widely felt from Frazier
Park (top of the Grapevine) to Santa Monica & Pasadena. Peak intensity was Modified
Mecalli IV. There was a M2.6 foreshock at 11:01 pm & a M2.4 aftershock at just shy of
11:04 pm, both of which might have been felt in the immediate Valencia area.
This epicenter is the same as that of the M3.2 on Monday.
--------------------------------------------------------------------------------
09:52 PDT Monday, August 25
A M3.2 at 12:31 am this morning was fairly widely felt in the San Fernando Valley & as
far north as Castaic. The epicenter was located 5 miles west of Valencia.
There also was a M2.7 quake near Bolsa Chica that was fetl in the Orange County area.
It occurred at 2:30 am & was located 2 miles south-southeast of Bolsa Chica Beach.
--------------------------------------------------------------------------------
17:19 PDT Thursday, August 21
We have recorded and located 201 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
15:29 PDT Tuesday, August 19
We just had another small one in a different "isolated area". There was a M3.6
near Mt. Whitney, in the Sierras, 16 miles southwest of Lone Pine. So far, we have
reports that it was felt in Porterville, Three Rivers, Lone Pine & Yosemite National Park.
--------------------------------------------------------------------------------
14:25 PDT Tuesday, August 19
There was a M3.0 quake early this afternoon, at 1:07 pm, 2 miles west-southwest of Ocotillo.
We don't have any felt reports yet, but it probably was felt in Ocotillo, judging from the size.
This epicenter is close to the Elsinore fault.
--------------------------------------------------------------------------------
09:07 PDT Monday, August 18
Two small quakes were felt over the weekend. The first was a M2.8 at 7:53 pm Friday night.
This quake occurred 5 miles east-southeast of Mt. Baldy & was reported felt in Wrightwood & Lytle Creek.
The other one was a M2.5 at 3:43 am, 4 miles south of Redlands. It was felt in Moreno Valley.
--------------------------------------------------------------------------------
17:31 PDT Thursday, August 14
We have recorded and located 180 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
13:19 PDT Friday, August 08
At 9:55 pm last night, there was a M3.0 offshore, 20 miles west of Avalon, Catalina Is.
Although the quake was probably felt on Catalina Is., we have no reports so far.
--------------------------------------------------------------------------------
18:04 PDT Thursday, August 07
We have recorded and located 192 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
08:07 PDT Thursday, August 07
There was a M2.9 quake at 10:48 pm last night, located 16 miles east of Barstow. As far as we know,
it was not felt. This quake might or might not (statistically speaking) be a Landers aftershock.
The epicenter is in a detached (from the main fault) group of such aftershocks & the aftershock
sequence in general can still be easily seen on the seismicity maps. However, that particular region
has been inactive for quite awhile.
--------------------------------------------------------------------------------
12:51 PDT Friday, August 01
We had two small quakes of note around the lunch hour today. First, at 11:35 am, there
was a M2.3 felt in the Topanga, Woodland Hills, Reseda, Tarzana, West Hills area.
The epicenter was in the Santa Monica Mtns., about 5 miles south-southeast of
Woodland Hills. This turns out to be about 1 miles east of Topanga Canyon Blvd.
The other quake was under the Salton Sea, 2 miles south of Bombay Beach.
The magnitude was M3.0 & the time was 12:06 pm. This location is near where the
southern end of the San Andreas fault hooks up with the Brawley Seismic Zone, which
runs almost north-south through the Imperial Valley. The focal mechanism is strike-slip,
with a strike consistent with the San Andreas.
--------------------------------------------------------------------------------
17:20 PDT Thursday, July 31
We have recorded and located 175 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
14:34 PDT Monday, July 28
There as a M2.9 quake early this afternoon in the Anza-Borrego desert about 11 miles
southeast of Ocotillo Wells. The time was 1:08 pm. So far we don't have any "felt reports".
This epicenter is in a fairly remote area, in the San Jacinto fault zone.
--------------------------------------------------------------------------------
17:20 PDT Thursday, July 24
We have recorded and located 158 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:24 PDT Friday, July 18
A small quake yesterday afternoon was reported felt in Alpine & El Cajon.
The epicenter was actually 9 miles east-southeast of Julian, but the magnitude
was M2.7, making it just possible to be felt at that distance. The time was 4:15 pm.
--------------------------------------------------------------------------------
17:04 PDT Thursday, July 17
We have recorded and located 189 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:19 PDT Thursday, July 17
A pair of M3+ quakes occurred early this morning offshore, 24 miles northwest of Pt. Arguello.
According to the U.S.G.S. in Menlo Park, the one at 3:08 am had a magnitude of M3.4 & the one
at 3:33 am was M3.6. So far, no-one has reported having felt either.
--------------------------------------------------------------------------------
08:01 PDT Tuesday, July 15
A M4.2 quake along the Landers rupture zone was fairly widely felt last night. The time
was 11:15 am & the epicenter was located 20 miles northeast of Lucerne Valley. The focal
mechanism is strike-slip. Because we can still see (after more than 10 years) the Landers
aftershock zone outlined in earthquakes on the seismicity maps, that means the aftershocks
are still going on & last night's quake is a Landers aftershock. Felt reports have come in
from the Big Bear, Lucerne Valley, Victorville, Barstow & Phelan areas so far.
--------------------------------------------------------------------------------
17:15 PDT Thursday, July 10
We have recorded and located 198 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
08:34 PDT Tuesday, July 08
A small quake was reported felt in Ontario this morning. The quake occurred at 6:50 am,
4 miles east-southeast of Ontario. Magnitude was M2.2.
--------------------------------------------------------------------------------
17:38 PDT Thursday, July 03
We have recorded and located 184 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
06:48 PDT Friday, June 27
Another small offshore quake occurred at 4:29 am this morning, this time 14 miles
southeast of San Clemente Island, or 60 miles west of San Diego. Magnitude was M3.2.
Due to its location, this quake has not been reported felt.
--------------------------------------------------------------------------------
17:00 PDT Thursday, June 26
We have recorded and located 186 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
14:32 PDT Thursday, June 26
A M2.2 quake was felt this morning in the Hemet area. The quake happened at
8:50 am & was located 5 miles east-southeast of Perris or 6 miles west of Hemet.
Felt reports came in from Hemet & Winchester.
--------------------------------------------------------------------------------
07:01 PDT Thursday, June 26
It's just slightly too far south to show on the map, but there was a M4.1 quake last
night offshore from San Diego. The time was 11:20 pm & the epicenter was located
42 miles south-southwest of San Ysidro. We have reports that the quake was felt in
Imperial Beach, Chula Vista & San Diego. It was probably felt in Ensenada as well,
but we don't have any reports.
--------------------------------------------------------------------------------
12:42 PDT Friday, June 20
There was a M3.5 quake, 11 miles southwest of Ocotillo this morning at 9:07 AM.
We have not received any "felt reports" as of yet.
--------------------------------------------------------------------------------
17:37 PDT Thursday, June 19
We have recorded and located 148 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
14:15 PDT Wednesday, June 18
A small quake (M2.6) was widely felt by many in Pasadena, including most people at the
Seismological Lab, this afternoon at 1:26 pm. The epicenter was located 2 miles northeast
of Caltech or 2 milse north of San Marino. We have received a considerable number of
"felt reports" from Pasadena, Altadens & surrounding communities.
Interestingly, there was a M2.0 foreshock at 1:09 pm (at the same location).
We got only about four felt reports for that one.
--------------------------------------------------------------------------------
16:32 PDT Tuesday, June 17
We revised the magnitude on the first of the Lytle Creek quakes down to M3.1. Since the two quakes
happened so close together in time, the amplitudes are intermixed & it took a little bit of inspection
to separate them. The focal mechanism, at least for the first quake, is strike-slip.
--------------------------------------------------------------------------------
14:00 PDT Tuesday, June 17
Two small quakes were felt early this afternoon in the Lytle Creek area. They were: a M3.3 at 1:25:05 pm & a M3.4
at 1:25:15 pm. Both were located approximately 5 miles northwest of Fontana & were felt in Rancho Cucamonga,
San Bernardino, Loma Linda, Crestline & Colton.
--------------------------------------------------------------------------------
09:58 PDT Monday, June 16
A M2.8 quake in the southern Sierra Nevada was felt Sunday afternoon. It occurred at 4:54 pm, 7 miles
south-southwest of Olancha & was reported felt in Olancha.
--------------------------------------------------------------------------------
07:30 PDT Friday, June 13
Two quakes were felt in southern California just after midnight:
The first was small, a M2.8 offshore of Orange County, 4 miles south-southwest of
Newport Beach. The time was 12:07 am. We have reports that this quake was felt in
Newport Beach, Huntington Beach, Costa Mesa & Irvine, with a peak intensity of Modified Mercalli III.
The other one was also small, a M3.1 at 12:52 am, located 3 miles north-northeast of Big Bear City.
We know that this quake was felt in Big Bear City, with an intensity of Modified Mercalli II.
--------------------------------------------------------------------------------
17:30 PDT Thursday, June 12
We have recorded and located 203 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
07:42 PDT Thursday, June 12
Multiple quakes were felt in the Imperial Valley yesterday evening. The two largest were a
M3.6 at 8:53 pm & a M3.4 at 8:54 pm, both located about 1 miles west-southwest of Brawley.
These were reported felt in Brawley, Westmorland, El Centro & Imperial. They were accompanied
by a cluster of smaller tremors, including a M2.5 & a pair of M2.3's.
--------------------------------------------------------------------------------
10:05 PDT Wednesday, June 11
A M2.2 in the Bellflower area at 8:06 pm last night was felt. The epicenter was located 1 mile
east-southeast of Bellflower & reports came in from Bellflower, Lakewood, Downey, Cerritos,
Long Beach & Paramount.
--------------------------------------------------------------------------------
17:30 PDT Thursday, June 05
We have recorded and located 157 earthquakes in the last week.
Click here to see a summary and a map.
---------------------------------------------------------------------------
09:56 PDT Thursday, June 05
There were two quakes in our area overnight of "feelable" size. The first occurred at 12:58 am, in Joshua
Tree Park, 11 miles north of Indio. Magnitude was M2.9. The quake was reported felt in Indian Wells,
which is in nearby Coachella Valley.
The second one was a M2.8 Landers aftershock, located in Homestead Valley,
16 miles north of Yucca Valley. It occurred at 7:16 am this morning.
We have no public reports, so far.
-----------------------------------------------------------------------------
08:18 PDT Wednesday, June 04
A M2.5 quake was widely felt in the greater L.A. area at 6:27 pm last night.
It was located 2 miles east ofCerritos & was felt in (among other places) Cerritos, Cypress,
Long Beach, Bellflower, Lakewood, Buena Park ...
--------------------------------------------------------------------------------
12:56 PDT Friday, May 30
Late this morning, a small quake was felt in Goleta. It had a magnitude of M2.1 & was located
beneath the Santa Barbara channel, 14 miles southwest of Santa Barbara.
--------------------------------------------------------------------------------
17:44 PDT Thursday, May 29
We have recorded and located 352 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
08:32 PDT Saturday, May 24
The Brawley swarm continued overnight at a somewhat reduced rate. Nothing that would
be noticed by the public has occurred since about midnight. We have had a slight revision
in magnitudes: M3.5 at 4:53 pm, M3.1 at 5:20 pm, M4.2 at 7:04 pm & M3.5 at 11:51 pm.
We are aware of a software bug that causes the real-time system, which is responsible
for the initial estimates, to underestimate the magnitudes in some geographic areas.
We are currently testing a new version off-line which should fix this problem.
--------------------------------------------------------------------------------
19:30 PDT Friday, May 23
It looks like the "tiny" Brawley swarm mentioned in the last entry is not so small any more.
So far this evening, there have been: a M3.5 at 4:53 pm, a M3.0 at 5:20 pm & a M4.0
at 7:04 pm, plus a few dozen smaller quakes. "Felt reports" have come in from Brawley,
El Centro & even the Yuma AZ area. The M4.0 was reported at Modified Mercalli
intensity V in the Brawley area (see the "Did You Feel It?" link above), which means
items were knocked off shelves & so forth. The typical Imperial Valley swarm could go
on for two to three days. Some historical swarms have included quakes in the M5 range
(for example, the Westmorland sequence in April of 1981), but most swarms do not include
quakes of this size.
--------------------------------------------------------------------------------
15:26 PDT Friday, May 23
We've just had two more small "felt" quakes: a M2.6 at 2:43 pm & a M2.8 at 2:55 pm.
They are the largest of another tiny swarm, located 2 miles southwest of Brawley,
in the Imperial Valley. Both these quakes were felt in Brawley.
--------------------------------------------------------------------------------
18:23 PDT Thursday, May 22
We have recorded and located 181 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:32 PDT Thursday, May 22
A small quake (M2.5) was fairly widely felt in the San Gabriel Valley this morning, at 8:53 am.
The epicenter was located 1 mile north-northwest of San Gabriel, not too far from
the Raymond Hill fault. The focal mechanism is strike-slip & consistent with that fault.
So far, we have reports that it was felt in Pasadena (including the Seismological Lab),
South Pasadena, Temple City, Monterey Park & nearby areas of Los Angeles.
--------------------------------------------------------------------------------
09:39 PDT Monday, May 19
There were several small earthquakes of interst over the weekend:
Late Friday afternoon, at 5:35 pm, a M2.9 quake was felt in Frazier Park & Lebec.
The epicenter was located 2 miles south-southeast of Frazier Park, not too far from
the San Andreas fault.
Later, at 12:18 am, there was a M2.7 Hector Mines aftershock, which took place 25 miles
north of Joshua Tree. It was, as far as we know, not felt, probably due to its remote location.
At 4:27 am (also on Saturday), a M3.1 quake occurred in the often active Brawley Seismic zone,
in the Imperial Valley. This quake was centered 2 miles east-northeast of Obsidian Butte.
We have a single report of its being felt in Calipatria.
Also, there was a pair of M2.7 quakes late Sunday night, 6 miles southwest of Ojai.
They occurred at 8:05 pm & 8:13 pm. Both were felt in Ojai & Ventura.
Finally, there was a M2.9 Landers aftershock, at 11:19 pm on Sunday, located 26 miles
east-northeast of Lucerne Valley. We have no "felt reports" on this quake, again due to
the remote location of the epicenter.
--------------------------------------------------------------------------------
17:14 PDT Thursday, May 15
We have recorded and located 159 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
17:14 PDT Thursday, May 15
We have recorded and located 159 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
12:05 PDT Thursday, May 15
A M3.6 quake was felt in the southern Sierra Nevada, 24 miles northeast of Lake Isabella
(17 miles south-southwest of Coso Junction). The time was 10:58 am today.
We have "felt reports" from Inyokern, Weldon & Caliente.
--------------------------------------------------------------------------------
17:06 PDT Wednesday, May 14
A M3.9 quake was felt this afternoon in the Coachella Valley & Palm Springs areas.
The location was 11 miles east-northeast of Indio, near the southern end of the Joshua Tree
National Monument. The time was 3:47 pm. This epicenter is a few miles to the east of the
San Andreas fault. The focal mechanism is strike-slip, consistent with the more or less
east-west striking faults in that area of the Little San Bernardino Mtns.
--------------------------------------------------------------------------------
08:05 PDT Monday, May 12
At 5:35 pm on Friday, there was a M2.9 Hector Mines quake, located 8 miles northwest of Ludlow.
We have no "felt reports", probably due to the quake's remote location.
--------------------------------------------------------------------------------
17:29 PDT Thursday, May 08
We have recorded and located 153 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
15:01 PDT Monday, May 05
We had another small "felt" quake at 2:29 pm today, located 2 miles east-northeast
of Mesa Grande, or 2 miles northwest of Julian. The magnitude was M2.6.
This quake was reported felt in Ramona.
--------------------------------------------------------------------------------
09:22 PDT Monday, May 05
The only "felt" quake this weekend occurred at 7:28 am on Saturday, 5 miles southwest of Yucaipa,
in the Inland Empire. It was lightly felt in the San Bernardino & Riverside areas.
--------------------------------------------------------------------------------
09:11 PDT Friday, May 02
There was a small quake early this morning (3:08 am) near Yorba Linda.
The magnitude was M2.4. As far as we know, it was not felt.
--------------------------------------------------------------------------------
17:15 PDT Thursday, May 01
We have recorded and located 171 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
09:52 PDT Wednesday, April 30
A small quake (M2.9) occurred this morning in the Death Valley region, 5 miles northwest
of Stovepipe Wells. The time was 9:19 am.
This quake has not been reported felt, probably due to its remote location.
--------------------------------------------------------------------------------
07:20 PDT Tuesday, April 29
A M3.3 quake was felt in the Borrego Springs area at 7:38 pm last night.
The epicenter was located 4 miles south-southeast of Ocotillo Wells, in the San Jacinto fault zone.
--------------------------------------------------------------------------------
07:54 PDT Monday, April 28
Another quake occurred early this morning around San Clement Island.
The time was 12:37 am & the magnitude was 3.1. The epicenter was 44 miles southeast of
San Clemente Island, or about 50 miles southwest of La Jolla. It was almost certainly not felt by anybody.
--------------------------------------------------------------------------------
15:39 PDT Friday, April 25
A M3.3 quake occurred offshore at 3:00 pm this afternoon, 19 miles west of San Clemente Island.
It was almost surely not felt, due to its location. It's on the map, however, so I'll mention it.
--------------------------------------------------------------------------------
18:26 PDT Thursday, April 24
We have recorded and located 194 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
14:49 PDT Tuesday, April 22
There was a small quake felt in the South Bay at 2:25 pm this afternoon.
The magnitude was M2.5 & the epicenter was located 2 miles south of LAX. It was felt in El Segundo,
Venice, Redondo, Hermosa & Manhattan Beaches, probably other locations as well.
---------------------------------------------------------------------------
09:02 PDT Sunday, April 20
The largest quake so far this weekend was a M3.2 at 4:50 pm on Saturday,
located in the Little San Bernardino Mtns. 9 miles northeast of Indio.
It was the largest of a swarm of about 20 members. It has not so far been reported felt.
A smaller quake (M2.0) was felt in Orange County, at 7:32 pm Saturday.
It was located 3 miles south of Fountain Valley, or 4 miles north of Newport Beach.
It was felt in Fountain Valley, Costa Mesa, Newport Beach & Huntington Beach.
Another small quake (M2.2) at 7:15 am this morning, was felt in the Julian & Ramona areas.
The epicenter was located 4 miles north of Julian.
-------------------------------------------------------------------------------
17:40 PDT Thursday, April 17
We have recorded and located 197 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
10:20 PDT Thursday, April 17
The Obsidian Butte swarm continued late yesterday. The largest event was a M3.2 at 4:36 pm,
located 2 miles northeast of Obsidian Butte. There were several smaller swarm members around that time.
--------------------------------------------------------------------------------
07:04 PDT Wednesday, April 16
Late yesterday evening, there was a M2.4 aftershock of Monday's M3.1 Compton quake.
The location was 1 mile northeast of Compton. We have reports that it was felt in Downey,
South Gate, Lakewood, Bellflower, etc.
--------------------------------------------------------------------------------
08:58 PDT Monday, April 14
Three quakes of public interest have occurred since this page was last updated:
There was a M3.3 member of the Big Bear City sequence (an aftershock of the M5.4 on February 22)
on Thursday, at 4:03 pm, which was felt in the Big Bear area.
Over the weekend, a small swarm occurred 2 miles east-northeast of Obsidian Butte in the northern
Imperial Valley. The largest member of the swarm was a M3.3 at 9:39 am on Sunday. We don't have
only one "felt report" (Niland), but the several members of the swarm were large enough to feel in
towns like Calipatria, Westmorland, as well.
The most widely felt of the weekend's activity was a M3.1 early this morning (3:09 am) 1 mile north of
Compton. It was felt pretty much throughout the Los Angeles Basin, with a peak intensity of Modified
Mercalli IV. People were awakened, but basically no damage.
--------------------------------------------------------------------------------
17:20 PDT Thursday, April 10
We have recorded and located 191 earthquakes in the last week.
-------------------------------------------------------------------------------
16:20 PST Thursday, April 03
We have recorded and located 180 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------------------------
10:02 PST Tuesday, April 01
A small quake (M2.5) might have been felt in the Inland Empire this morning.
The time was 7:08 am & the epicenter was 3 miles south of Yucaipa.
--------------------------------------------------------------------------------
07:02 PST Monday, March 31
Among smaller quakes in the same area, Death Valley experienced another M3.0 quake on Sunday at 12:40 pm.
The epicenter was located 2 miles northwest of Stovepipe Wells.
--------------------------------------------------------------------------------
09:30 PST Friday, March 28
We may have had another small San Fernando Valley quake felt this morning.
The quake was a M2.2 at 9:03 am, located 3 miles northwest of Canoga Park. There have been "felt reports"
at about the same time from Simi Valley & West Hills.
--------------------------------------------------------------------------------
22:29 PST Thursday, March 27
A small quake (M2.9) was felt in San Fernando Valley this evening, at 9:44 pm.
It occurred 2 mile south of Encino. It was widely felt on the West Side & in San Fernando Valley.
--------------------------------------------------------------------------------
16:21 PST Thursday, March 27
We have recorded and located 181 earthquakes in the last week. Click here to see a summary and a map.
--------------------------------------------------------------------------------
15:03 PST Monday, March 24
Another quake was felt at 1:34 pm today, this time a very small one located 2 miles northwest of South Gate.
The magnitude was M2.3. It was felt in South Gate, Bell & Los Angeles.
--------------------------------------------------------------------------------
10:10 PST Monday, March 24
A quake was felt in Orange County & San Diego County this morning at 9:34 am.
The magnitude was M3.1 & the epicenter was located offshore, 16 miles southwest of Dana Point.
We are starting to get reports of people having felt it.
--------------------------------------------------------------------------------
12:55 PST Friday, March 21
There were a few more quakes in the Death Valley area late this morning, including a M3.5 at 10:46 am & a M3.0 at 11:20 am.
There were located about 5 miles northwest of Stovepipe Wells. We have one report that the M3.5 was felt in Death Valley.
--------------------------------------------------------------------------------
16:29 PST Thursday, March 20
We have recorded and located 191 earthquakes in the last week.
--------------------------------------------------------------------------------
06:50 PST Thursday, March 20
A small quake was felt just after midnight in Ontario, Chino & Ontario.
The time was 12:16 am & the magnitude was M2.4. The quake was located 5 miles east-southeast of Ontario.
--------------------------------------------------------------------------------
09:46 PST Saturday, March 15
There was a M3.6 quake in the Big Bear City sequence early this morning, at 2:01 am.
It's epicenter was located 3 miles north of Big Bear City. I don't see any "felt reports" yet, but it probably was felt.
We also had a M2.9 in the Death Valley area (3 miles northwest of Stovepipe Wells) last night at 9:14 pm.
We don't have any reports on that one, either.
----------------------------------------------------------
16:32 PST Thursday, March 13
We have recorded and located 376 earthquakes in the last week.
Click here to see a summary and a map.
-----------------------------------------------------------
07:26 PST Wednesday, March 12
We recorded a M2.9 Hector Mines aftershock this morning at 5:38 am.
Like the others yesterday, it was located 16 miles north-northwest of Twentynine Palms.
So far we have not reports that it was felt.
------------------------------------------------------------
12:45 PST Tuesday, March 11
There was a widely felt Hector Mines aftershock late this morning, at 11:28 am.
Its epicenter was located 16 miles north-northwest of Twentynine Palms or 19 miles
northeast of Joshua Tree. The magnitude was ML4.6. Felt reports came from the
Twentynine Palms & Joshua Tree ares, of course, and Barstow, Hemet & the Inland Empire,
with a few reports from as far as Orange County & San Diego.
There was also a M3.2 "aftershock of the aftershock" at 11:31 pm.
-----------------------------------------------------------
07:38 PST Friday, March 07
A very small quake was felt early this morning, at 2:07 am, in Montebello.
The quake was a M2.0, located 1 mile west of the Whittier Narrows Recreation area.
------------------------------------------------------------
16:20 PST Thursday, March 06
We have recorded and located 370 earthquakes in the last week.
Click here to see a summary and a map.
--------------------------------------------------------------
10:38 PST Wednesday, March 05
We had a M3.0 Hector Mines quake at 8:05 am this morning. It was located 8 miles west
of Ludlow & should have been felt there. Hector Mines aftershocks are getting pretty rare.
However, if you look at the map regularly, you can still see the sequence, so the aftershocks aren't over.
---------------------------------------------------------------
07:59 PST Monday, March 03
We've had a little bit more activity in the Imperial Valley over the weekend,
the largest being a M3.2 at 1:57 am this morning, located 4 miles east-northeast
of Obsidian Butte (at the souteastern end of the Salton Sea). As far as we know,
the quake was not felt.
-----------------------------------------------------------------
11:02 PST Sunday, March 02
The Big Bear City aftershocks have been declining pretty much as expected.
The only notable one recently was a M3.0 at 9:59 am today, which was felt
in Big Bear City. It was located 4 miles north of Big Bear City.
There was also a M3.2 in northern Baja, 38 miles south-southeast of Ocotillo,
at 3:50 am this morning. We don't have any reliable "felt reports" on this one,
but you will see it on the map.
-----------------------------------------------------------------
16:50 PST Thursday, February 27
We have recorded and located 657 earthquakes in the last week.
Click here to see a summary and a map.
-----------------------------------------------------------------
07:34 PST Thursday, February 27
The latest Big Bear aftershock was a M4.0 overnight, at 9:00 pm last night, at the
same location as the rest, 3 miles north-northeast of Big Bear City. You may not be
able to see it in the "Recent Earthquakes" map, but the aftershock locations are
lining up on a north-northwest to south-southeast direction (called "strike" in geology
terms). This line-up is part of the evidence that leads us to tentatively assign the
sequence to the Helendale fault, which has the same strike. Last night's quake was
on the south-southeasternly end. It was widely felt in the Inland Empire.
--------------------------------------------------------------------
09:33 PST Wednesday, February 26
Another Big Bear area aftershock was felt at 5:45 pm yesterday. It had a magnitude
of M3.6 & was located 5 miles north of Big Bear City.
It was felt in the Big Bear & Lucerne Valley areas.
---------------------------------------------------------------------
07:42 PST Tuesday, February 25
A moderate (ML4.6) aftershock in the Big Bear City sequence occurred yestertday
evening at 8:03 pm. This epicenter was located 4 miles north of Big Bear City.
It was widely felt in the Inland Empire, and as far away as Orange County &
Palmdale & Lancaster. There have also been 7 more M3+ aftershocks since the
M4.5 at 11:33 am on Saturday.
In addition, there was a M3.2 near Borrego Springs at 3:06 pm yesterday.
The epicenter was 14 miles north-northwest of Borrego Springs.
It was felt in the Anza area.
---------------------------------------------------------------------
13:06 PST Saturday, February 22
Here is a short summary of the aftershock sequence so far: in addition to the ML5.4,
there have been five quakes larger than M4 & eight additional ones larger than M3.
The largest aftershock is a M4.5 at 11:35 am today, in the same area 3 miles north of Big Bear City.
---------------------------------------------------------------------
07:46 PST Saturday, February 22
Analysis of this morning's ML5.4 earthquake indicate a strike-slip focal mechanism,
with a strike consistent with the nearby Helendale fault. We cannot say for certain
that the quake was on that fault unless there is surface rupture observed, but the
evidence seems consistent.
----------------------------------------------------------------------
05:18 PST Saturday, February 22
At 4:19 am this morning, a M5.4 quake in the San Bernardino Mtns. was widely
felt in the Inland Empire & greater Los Angeles. The peak intensity reported is
Modified Mercalli V. So far, there have been 9 aftershocks of M3.0 or larger,
the largest of which was a M4.5 at 4:20 am. All were centered 3 miles north of Big Bear City.
------------------------------------------------------------------------
06:47 PST Friday, February 21
People in the South Bay towns of Manhattan Beach & El Segundo reported a very
small quake yesterday evening. It was, in fact, a M2.3 located just offshore 3 miles
west of Manhattan Beach. The time was 7:33 pm.
--------------------------------------------------------------------------
16:26 PST Thursday, February 20
We have recorded and located 193 earthquakes in the last week.
---------------------------------------------------------------------------
SPECIAL REPORT ON THE BIG BEAR QUAKE SERIES
-----------------------------------------------------------------------------
13:34 PST Wednesday, February 19
A second M3 class earthquake (this one M3.1) occurred a few seconds before 1:01 pm today,
also 17 miles south-southeast of Taft. Like this morning's quake, this one is near the San Andreas fault.
It was also felt in Pine Mountain & Maricopa.
--------------------------------------------------------------------------------
09:59 PST Wednesday, February 19
A M3.4 quake occurred this morning at 9:10 am, 18 miles south-southeast of Taft, near
the San Andreas fault. We have some reports that it was felt at Pine Mountain & Maricopa.
The preliminary focal mechanism shows strike-slip.
--------------------------------------------------------------------------------
08:15 PST Wednesday, February 19
Two small quakes popped up overnight that might have been felt. The first was a M2.9 at 7:09 pm last night, l
ocated 19 miles southwest of Calexico. This epicenter is south of the U.S./Mexico border, but not too far south of it.
The other quake was a M2.8 at 1:40 am this morning, located 9 miles north-northwest of Borrego Springs.
--------------------------------------------------------------------------------
17:20 PST Thursday, February 13
We have recorded and located 214 earthquakes in the last week. Click here to see a summary and a map.
==================================================================================
07:37 PST Monday, February 10
Two more feelable Arvin quakes popped up on Saturday. These were a M3.0 at 4:09 pm & a M3.2 at 11:05 pm.
Both were located 12 miles northeast of Arvin, near Caliente. We don't have any "felt reports" on them so far.
====================================================================================
07:25 PST Friday, February 07
The 2:34 am Baja quake turned out to be slightly farther away that where it was automatically located & also
slightly larger in magnitude. It is now a ML5.0. The epicenter was 72 miles south of Calexico (which is just
across the border from Mexicali). It was felt in Imperial Valley, San Diego & points in between such as Pine
Valley, Jamul, etc. The peak intensity was Modified Mercalli IV, reported in El Centro. No doubt it was felt
in Mexico as well, but we only get reports from within the U.S.
Note that these quakes (the M5.0 & its two aftershocks) are slightly too far south to show on the "Recent
Earthquakes" map.
=======================================================================================
17:00 PST Thursday, February 06
We have recorded and located 258 earthquakes in the last week. Click here to see a summary and a map.
======================================================
08:36 PST Thursday, February 06
Another small quake occurred at 8:02 am, 6 miles southwest of Corona.
Since it was in a populated area, this quake was a M2.6.
It was probably felt, but at the moment we have no such reports.
========================================================
07:08 PST Thursday, February 06
A small quake was felt at 2:39 am this morning, in the town of Ocotillo.
The magnitude was M2.8 & the epicenter was located 3 miles south of Ocotillo.
=========================================================
08:10 PST Monday, February 03
Two small quakes were felt in southern California on Saturday. These were: a M3.2 in the Little San
Bernardino Mtns., 11 miles east of Indio, at 9:26 am, and a M2.9 member of the Arvin swarm, 12 miles
northeast of Arvin at 3:20 pm. Both were lightly felt in their respective epicentral areas.
We received a number of reports of quake in the Palmdale/Lancaster area between 2:45 pm and 3:30 pm
on Sunday, but we see no earthquakes in our data. They may have been sonic booms. We are currently
looking at the data in more detail to verify this.
Finally, early this morning, a M3.0 quake was felt in the Cajon Pass & surrounding areas (Lytle Creek,
Fontana, San Bernardino, Riverside). This quake occurred at 12:42 am & was located 4 miles west of
Redlands.
===========================================================
07:01 PST Friday, January 31
Another quite small quake was felt by several people early this morning in the Santa Maria area. It was a
M2.1 at 4:27 am, located 8 miles south of Santa Maria.
============================================================
16:35 PST Thursday, January 30
We have recorded and located 291 earthquakes in the last week. Click here to see a summary and a map.
===========================================================
07:45 PST Thursday, January 30
A small (M2.4) quake was felt last night in the Culver City, Santa Monica, West Hollywood
areas & parts of Los Angeles. The quake occurred at 9:52 pm & was located 2 miles north-northeast of the
Baldwin Hills, or 3 miles northeast of Culver City.
============================================================
08:17 PST Wednesday, January 29
Two small members of the Arvin sequence, a M2.9 at 6:19 pm and a M3.0 at 6:21 pm, were felt
in Bear Valley Springs & California City early yesterday evening. As with the others, these quakes
occurred 12 miles northeast of Arvin.
Readers should note that the Arvin swarm is not unprecedented. In late 1983 & early 1984,
the Durwood swarm, 20 miles north of Lake Isabella, went on for about 6 months. The largest
event in the Durwood swarm was M4.5.
=============================================================
06:26 PST Tuesday, January 28
Yesterday afternoon, at 1:48 pm, a small quake was felt in the Santa Maria area (with a couple of
isolated reports from Santa Barbara & San Simeon). The epicenter was located 5 miles south of
Santa Maria & the magnitude was M2.6.
=============================================================
01:55 PST Saturday, January 25
We had another pair of twin quakes in the Arvin area (12 miles NE of Arvin).
There was a M3.7 quake at 1:11 am followed by a M4.2 quake just five minutes later at 1:16 am.
These events have been reported felt in the Bakersfield area. So far, these are the largest
quakes of a continuing swarm in the Arvin area (which also produced a pair of M3.6 events on January 2).
=============================================================
06:38 PST Friday, January 24
There were some very sensitive people in the Culver City area yesterday: we got several "felt" calls
on a M1.9 at 5:09 pm, located 1 mile northeast of Culver City, in the Baldwin Hills.
The reports came from Culver City & portions of Los Angeles.
==============================================================
16:51 PST Thursday, January 23
We have recorded and located 214 earthquakes in the last week. Click here to see a summary and a map.
================================================================
13:19 PST Wednesday, January 22
A quake was felt in the Santa Monica & Venice areas & other beach communities at 12:28 pm today (just
after noon). It was a M3.0, which occurred offshore, 8 miles west-southwest of Los Angeles airport.
06:14 PST Wednesday, January 22
Upon further inspection, the Cabazon quake yesterday evening was M2.6. The real-time computer was
apparently confused by the waves coming in from the Mexico earthquake. Our M2.6 quake occurred at
6:29 pm, 6 miles north-northeast of Cabazon. It was felt in Palm Springs.
=================================================================
19:29 PST Tuesday, January 21
A M3.2 quake occurred early this evening, at 6:29 pm, 6 miles north of Cabazon.
We have no "felt reports" at this time.
08:37 PST Tuesday, January 21
One more small quake was felt over the long weekend: a M2.2 in the Baldwin Hills area at
4:20 pm on Monday. We only got a couple of "felt reports" from the
epicentral area. The quake occurred under Baldwin Hills.
===============================================================
08:35 PST Monday, January 20
This morning at 6:57 am, a M3.2 quake occurred in the Imperial Valley, 2 miles south-southeast of El
Centro. It was felt in the towns of Calexico, El Centro & Heber.
=================================================================
09:28 PST Saturday, January 18
A M2.9 quake was felt in the western San Fernando Valley & Sime Valley overnight. It occurred at 2:43
am, 3 miles north-northeast of Chatsworth.
==================================================================
16:46 PST Thursday, January 16
We have recorded and located 262 earthquakes in the last week. Click here to see a summary and a map.
===================================================================
07:07 PST Wednesday, January 15
A M3.2 quake hit the southern Owens Valley at 1:46 am this morning. It was located 4 miles northwest of
Coso Junction, near the steep "front" of the Sierra Nevada. We have no reports so far that the quake was felt.
=====================================================================
08:44 PST Monday, January 13
Three more small Baldwin Hills quakes were felt over the weekend. These were: a M2.6 at 6:58 pm on Friday,
a M2.8 at 11:54 pm on Friday & a M2.4 at 3:10 am this morning. All three took place under the Baldwin Hills.
All three were felt in the West Los Angeles & Culver City areas.
The Arvin swarm in Kern County also had another "feelable" member: a M3.0 at 3:05 am on Sunday. We have
received no reports that it was felt, however. This quake occurred at the same place that has produced more
than 270 small quakes since mid-December: in the Sierra foothills 12 miles northeast of Arvin. The largest
events in the swarm were a pair of M3.6's on January 2.
There was also a M3.8 quake in northern Baja, 23 miles southeast of Calexico, at 6:28 am this morning. It was
slightly felt in the El Centro area.
=======================================================================
16:23 PST Thursday, January 09
We have recorded and located 303 earthquakes in the last week.
=======================================================================
14:06 PST Friday, January 03
We have recorded and located 217 earthquakes in the last week. Click here to see a summary and a map.
=========================================================================
11:26 PST Thursday, January 02
The New Year rang in with twins. A pair of M3.6's, both in the same location (12 miles
northeast of Arvin), rumbled in four minutes apart of each other. The first occurring
at 8:11 am. Both earthquakes have been reported as felt in the Tehachapi and Bakersfield
areas. The plot thickens since the first earthquake M3.0 or greater for the year was a
M3.0 on New Years Day at 1:02 pm in the same location as the twins. There were no reports
of this earthquake being felt.
==========================================================================
