SCSNDuty Seismologist – SCSN

04/05/2021, M4.0 near Lennox

Duty Seismologist — Mon, 05 Apr 2021 12:13:42 +0000

Event

05 Apr 2021 04:44:01 PDT, (33.940, -118.333), depth 19.3km.
2km E of Lennox, California

Aftershocks

As of 13 Apr 2021, 09:21AM PDT, there have been 107 aftershocks recorded.
The largest was M2.4 (smallest M0.8).
More aftershocks may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock.
There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.

Possible Foreshocks

There were 3 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M3.3 (2021/04/05).

Historical Seismicity

Since our records began in 1932 we’ve had 14 events of M4 or greater within 10km of today’s event.
The largest historic event was M5.1 on 1941/11/14.
The most recent historic event was M4.0 on 19 May 2009.

Faults

CFM fault associations: most likely Newport; Inglewood fault segment (56%). Alternates: Not associated with a CFM modeled fault (36%), Other CFM faults (8%).*
Nearby faults: Newport-Inglewood-Rose Canyon fault zone, north Los Angeles basin section (0.3 km), Charnock fault (4.3 km) and Palos Verdes fault zone, Palos Verdes Hills section (Palos Verdes Hills fault) (14.3 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed.

*Earthquakes can occur both near or on major known faults, and in places where no clear fault zones are known. Using the statistical method of Evans et al. (in prep. 2019) the location and focal mechanism of this earthquake suggest the above association with modeled faults in the Community Fault Model (CFM) provided by the Southern California Earthquake Center (SCEC) and Harvard University. Note that the CFM fault association may be different from the nearby faults list. Differences may arise due to different fault databases, and because the CFM fault association uses the hypocenter with relation to subsurface 3-dimensional fault orientation models, while the nearby faults list utilizes mapped surface traces as they relate to the epicenter.

CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth & Planetary Sciences.

Probability: The probability in percent the earthquake is associated with this fault.

SCSN: Caltech/USGS Southern California Seismic Network

**Quaternary Fault and Fold Database for the Nation; 2004; FS; 2004-3033; Geological Survey (U.S.), accessed 2021, from USGS web site: https://www.usgs.gov/natural-hazards/earthquake-hazards/faults

This information is subject to change as more up-to-date data become available.

02/08/2020, M3.9 near Barstow

Duty Seismologist — Mon, 10 Feb 2020 15:34:04 +0000

Event

08 Feb 2020 11:34:20 PST, (35.095, -116.967), depth 2.3km.
22km NNE of Barstow, California

Aftershocks

As of 10 Feb 2020, 07:31AM PST, there has been 1 aftershock recorded, M2.6.
Aftershocks may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock.
There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.

Possible Foreshocks

There were 1 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M1.3 (2020/02/05).

Historical Seismicity

Since our records began in 1932 we’ve had 22 events of M4 or greater within 10km of today’s event.
The largest historic event was M5.3 on 1997/03/18.
The most recent historic event was M4.6 on 25 Jan 2020.

Faults

Nearby faults: Coyote Lake fault (5.1 km), Blackwater fault zone (Owl Canyon fault) (8.2 km), Blackwater fault zone (Rainbow Canyon fault) (9.1 km), Blackwater fault zone (Fossil Canyon fault) (10.5 km), Blackwater fault zone (11.3 km), Blackwater fault zone (Coon Canyon fault) (11.3 km), Blackwater fault zone (Blackwater fault) (12.3 km) and Harper fault zone (Harper Lake fault) (14.7 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

**U.S. Geological Survey and California Geological Survey, 2006, Quaternary fault and fold database for the United States, accessed 2015, from USGS web site: https://earthquake.usgs.gov/hazards/qfaults/

This information is subject to change as more up-to-date data become available.

02/01/2020, M3.6 near Anza

Duty Seismologist — Sun, 02 Feb 2020 01:13:56 +0000

Event

01 Feb 2020 16:59:50 PST, (33.578, -116.817), depth 4.7km.
13km W of Anza, California

Aftershocks

As of 01 Feb 2020, 05:12PM PST, there have been 5 aftershocks recorded.
The largest was M2.0 (smallest M0.2).
More aftershocks may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock.
There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.

Possible Foreshocks

There were 14 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M1.2 (2020/02/01).

Historical Seismicity

Since our records began in 1932 we’ve had 12 events of M4 or greater within 10km of today’s event.
The largest historic event was M5.3 on 1963/09/23.
The most recent historic event was M4.4 on 15 Aug 2018.

Faults

Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (7.6 km), San Jacinto fault zone, Anza section (Thomas Mountain fault) (12.7 km) and San Jacinto fault zone, San Jacinto Valley section (Hot Springs fault) (14.8 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

This information is subject to change as more up-to-date data become available.

09/10/2019, M4.0 near Wildomar

Duty Seismologist — Tue, 10 Sep 2019 20:28:59 +0000

Event

10 Sep 2019 13:21:49 PDT, (33.598, -117.260), depth 14.2km.
2km E of Wildomar, California

Aftershocks

As of 10 Sep 2019, 01:25PM PDT, there have been no aftershocks recorded.
Aftershocks may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock.
There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.

Possible Foreshocks

There were 2 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M1.4 (2019/09/10).

Faults

Nearby faults: Elsinore fault zone, Temecula section (Wildomar fault) (0.2 km), Elsinore fault zone, Temecula section (Willard fault) (0.9 km), Elsinore fault zone, Glen Ivy section (Glen Ivy North fault) (3.0 km), Elsinore fault zone, Temecula section (5.4 km), Murrietta Hot Springs fault (7.0 km) and Elsinore fault zone, Temecula section (Murrieta Creek fault) (11.4 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth & Planetary Sciences.

< p>Probability: The probability in percent the earthquake is associated with this fault.

SCSN: Caltech/USGS Southern California Seismic Network

This information is subject to change as more up-to-date data become available.

01/29/2019, M3.6 near Lucerne Valley

Duty Seismologist — Wed, 30 Jan 2019 02:51:34 +0000

29 Jan 2019 18:40:12 PST, (34.408, -116.892), depth -0.5km, 8km ESE of Lucerne Valley, California
Aftershocks: so far there have been no aftershocks recorded. Some may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
Historical seismicity: since our records began in 1932 we’ve had 53 events of M4 or greater within 10km of today’s event, the largest was M5.3 (1992/11/27) and the most recent was M4.6 on 05 Jul 2014.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

01/22/2019, M3.6 near Brawley

Duty Seismologist — Wed, 23 Jan 2019 21:27:35 +0000

22 Jan 2019 00:24:44 PST, (32.947, -115.515), depth 15.4km, 4km SSE of Brawley, California
Aftershocks: so far (23 Jan 2019, 01:22PM PST) there have been 12 aftershocks recorded, the largest M2.7 (smallest M1.1). More may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
There were 1 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M3.1 (2019/01/22).
Historical seismicity: since our records began in 1932 we’ve had 93 events of M4 or greater within 10km of today’s event, the largest was M6.9 (1940/05/19) and the most recent was M4.2 on 28 Aug 2012.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed.

01/16/2019, M3.9 near Niland

Duty Seismologist — Thu, 17 Jan 2019 03:30:43 +0000

16 Jan 2019 18:41:34 PST, (33.182, -115.608), depth 2.9km, 10km SW of Niland, California
Aftershocks: so far (16 Jan 2019, 07:29PM PST) there have been 3 aftershocks recorded, the largest M2.9 (smallest M1.6). More may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
There were 3 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M2.2 (2019/01/14).
Historical seismicity: since our records began in 1932 we’ve had 75 events of M4 or greater within 10km of today’s event, the largest was M6.2 (1987/11/24) and the most recent was M4.1 on 27 Sep 2016.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed.

11/29/2018, M3.9 near Ocotillo Wells

Duty Seismologist — Thu, 29 Nov 2018 14:32:02 +0000

29 Nov 2018 05:48:53 PST, (33.015, -115.983), depth 11.4km, 20km SE of Ocotillo Wells, California
Aftershocks: so far there have been no aftershocks recorded. Some may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
Historical seismicity: since our records began in 1932 we’ve had 59 events of M4 or greater within 10km of today’s event, the largest was M6.6 (1987/11/24) and the most recent was M4.6 on 04 Nov 2010.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed.

11/19/2018, M4.8 near Alberto Oviedo Mota

Duty Seismologist — Tue, 20 Nov 2018 16:31:13 +0000

19 Nov 2018 12:18:42 PST, (32.207, -115.253), depth 10.9km, 8km WSW of Alberto Oviedo Mota, B.C., Mexico
Aftershocks: so far (20 Nov 2018, 08:29AM PST) there have been 11 aftershocks recorded, the largest M3.5 (smallest M2.2). More may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
Historical seismicity: since our records began in 1932 we’ve had 124 events of M4 or greater within 10km of today’s event, the largest was M7.2 (2010/04/04) and the most recent was M4.4 on 29 Sep 2018.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

11/09/2018, M3.8 near Aguanga

Duty Seismologist — Fri, 09 Nov 2018 15:25:56 +0000

Two events above M3.5 have occurred in the ongoing Cahuilla swarm:
- 09 Nov 2018 06:45:50 PST, (33.483, -116.802), depth 2.0km, 7km NE of Aguanga, California
- 09 Nov 2018 06:58:09 PST, (33.485, -116.803), depth 1.1km, 7km NE of Aguanga, California
Aftershocks: so far (09 Nov 2018, 02:04PM PST) there have been 87 aftershocks recorded since the second, larger event, the largest M2.0 (smallest M0.1). More may be expected in the next few days, the largest expected is approximately 1 magnitude unit smaller than the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
There were 91 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was the M3.7 (2018/11/09).
Historical seismicity: since our records began in 1932 we’ve had 14 events of M4 or greater within 10km of today’s event, the largest was M5.6 (2005/06/12) and the most recent was M4.4 on 15 Aug 2018. Since the onset of the Cahuilla swarm in 2016, we have now recorded over 9000 events.
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.