• 12 Jan 2022 19:19:08 PST, (33.472, -116.445), depth 13.9km.
• 23km ESE of Anza, California

Aftershocks

• As of 13 Jan 2022, 07:14AM PST, there have been 95 aftershocks recorded.
• The largest was M2.9 (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 3 events during the 3 days prior to the earthquake (within a 10 km radius).
• The largest was M0.8 (2022/01/13).

Historical Seismicity

• Since our records began in 1932 we’ve had 40 events of M4 or greater within 10km of today’s event.
• The largest historic event was M6.0 on 1937/03/25.
• The most recent historic event was M4.9 on 04 Apr 2020.

Faults

• CFM fault associations: most likely Clark fault; south segment (52%). Alternates: Not associated with a CFM modeled fault (4%), Other CFM faults (44%).*
• Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (1.4 km), San Jacinto fault zone, Anza section (Buck Ridge fault) (2.5 km), San Jacinto fault zone, Anza section (2.7 km), San Jacinto fault zone, Coyote Creek section (5.2 km) and San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (5.5 km).**
  

Additional Information

• Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
• Visit our special reports page for further information on local notable earthquakes.
• Visit scedc.caltech.edu to access any data recorded by the SCSN.

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

• 21 Sep 2021 15:41:30 PDT, (33.635, -116.715), depth 13.2km.
• 10km NNW of Anza, California

Aftershocks

• As of 21 Sep 2021, 05:15PM PDT, there have been 61 aftershocks recorded.
• The largest was M3.3 (smallest M0.3).
• 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 25 events during the 3 days prior to the earthquake (within a 10 km radius).
• The largest was M1.3 (2021/09/21).

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 M5.6 on 2005/06/12.
• The most recent historic event was M4.4 on 15 Aug 2018.

Faults

• CFM fault associations: most likely Clark fault; north segment (69%). Alternates: Not associated with a CFM modeled fault (5%), Other CFM faults (26%).*
• Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (0.7 km), San Jacinto fault zone, Anza section (Thomas Mountain fault) (2.2 km), San Jacinto fault zone, San Jacinto Valley section (Hot Springs fault) (5.1 km) and San Jacinto fault zone, Anza section (Buck Ridge fault) (7.2 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.

• 03 Apr 2020 18:53:18 PDT, (33.490, -116.507), depth 10.4km.
• 17km ESE of Anza, California
• The highest intensity shaking recorded by an instrument was MMI VI, strong shaking, at 9km from the event epicenter. Felt (mostly weak/light) shaking was reported along much of the length of the southern California coast, from Santa Monica to San Diego, with over 19,000 felt reports submitted to the USGS Did You Feel It? website.

Aftershocks

• As of 07 Apr 2020, 02:21PM PDT, there have been 1426 aftershocks recorded. There have been 8 aftershocks of M3 or larger, and 68 aftershocks of M2 or larger.
• The largest was M3.8 (smallest M-0.1).
• 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 M1.0 (2020/04/02).

Historical Seismicity

• Since our records began in 1932 we’ve had 42 events of M4 or greater within 10km of today’s event.
• The largest historic event was M5.6 on 2005/06/12.
• The most recent historic event was M5.2 on 10 Jun 2016.

Faults

• CFM fault associations: most likely Clark fault (San Jacinto fault zone); north segment (50%). Alternates: Not associated with a CFM modeled fault (3%), Other CFM faults (47%).*
• Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (1.5 km), San Jacinto fault zone, Anza section (Buck Ridge fault) (1.9 km), San Jacinto fault zone, Anza section (2.9 km), San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (3.6 km) and San Jacinto fault zone, Coyote Creek section (7.4 km).**
• The San Jacinto fault zone is the most active fault, in terms of regular seismic activity, in southern California. The focal mechanism suggests this was a right-lateral strike-slip earthquake, consistent with the motion of the San Jacinto fault (and the Pacific:North American plate boundary motion).

Additional Information

• Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
• Visit our special reports page for further information on local notable earthquakes:
• 2016/06/10 M5.2 near Borrego Springs (9km from 2020/04/03 event)
• 2005/06/12 M5.2 near Anza (7 km from 2020/04/03 event)
• 2001/10/30 M5.1 near Anza (2 km from 2020/04/03 event)

Below are the waveform data associated with this sequence, as recorded in our Live Seismograms Feed. The mainshock m4.9 and subsequent m3.5+ aftershocks can be viewed in the playlist below.The closest stations to the epicenter represented below are CI.HMT2 and CI.WWC at approximately 51 km away.

• 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.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed. The closest stations represented in the feed below are CI.WWC and CI.HMT2 at 51.7km and 52.5km away from the epicenter respectively.