SCSNBrawley – SCSN https://www.scsn.org/index.html Southern California Seismic Network Mon, 19 May 2025 19:35:22 +0000 en-US hourly 1 https://wordpress.org/?v=5.1.12 05/18/2024, M3.7 swarm near Brawley ../../../../index.php/2024/05/18/05-18-2024-m3-7-swarm-near-brawley/index.html ../../../../index.php/2024/05/18/05-18-2024-m3-7-swarm-near-brawley/#respond Sat, 18 May 2024 18:04:06 +0000 http://www.scsn.org/?p=4951 …
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]]> Significant Events

  • Largest event: M3.7, 18 May 2024 02:36:37 PDT, (32.933, -115.540), depth 11.7km. 5km S of Brawley, California.
  • As of 20 May 2024, 07:41AM PDT, the following event numbers have been recorded in the swarm:
    • M≥3: 18
    • M≥2: 79
  • All M3 events recorded:
    • M 3.1 18 May 2024 02:18:35 PDT, (32.930, -115.540), 40589359
    • M 3.7 18 May 2024 02:36:37 PDT, (32.933, -115.540), 40589407
    • M 3.0 18 May 2024 03:17:33 PDT, (32.925, -115.533), 40589495
    • M 3.6 18 May 2024 05:38:00 PDT, (32.932, -115.538), 40589719
    • M 3.2 18 May 2024 05:38:35 PDT, (32.928, -115.542), 40589727
    • M 3.5 18 May 2024 05:41:52 PDT, (32.937, -115.537), 40589751
    • M 3.7 18 May 2024 08:52:13 PDT, (32.937, -115.537), 40590231
    • M 3.5 18 May 2024 09:30:18 PDT, (32.937, -115.533), 40590383
    • M 3.8 18 May 2024 12:17:22 PDT, (32.930, -115.543), 40590759
    • M 3.4 18 May 2024 12:46:17 PDT, (32.930, -115.542), 40590799
    • M 3.0 18 May 2024 14:23:17 PDT, (32.905, -115.535), 40590943
    • M 3.5 18 May 2024 15:58:19 PDT, (32.922, -115.543), 40591047
    • M 3.9 18 May 2024 16:05:05 PDT, (32.935, -115.543), 40591055
    • M 3.4 18 May 2024 16:05:31 PDT, (32.923, -115.550), 40591063
    • M 3.1 18 May 2024 16:06:34 PDT, (32.930, -115.545), 40591079
    • M 3.7 18 May 2024 16:13:26 PDT, (32.933, -115.535), 40591087
    • M 3.3 18 May 2024 16:24:09 PDT, (32.928, -115.535), 40591119
    • M 3.1 20 May 2024 01:43:27 PDT, (32.922, -115.533), 40593359

Swarm Numbers

  • As of 20 May 2024, 07:41AM PDT, we have recorded 264 events in the swarm (within a 20 km radius, and counting 5 days before the largest event). The smallest event is magnitude 0.9. Many of the smaller events are still being analyzed and will be gradually added to the catalogue.
  • More activity is expected in the next few days, swarm activity in Southern California can continue for hours, days, weeks, months or years. For more information on swarms please see our Swarm page.

Historical Seismicity

  • Since our records began in 1932 we’ve had 116 events of M4 or greater within 10km of today’s event.
  • The largest historic event was M6.9 on 1940/05/19.
  • The most recent historic event was M4.6 on 12 Feb 2024.

Faults

  • CFM fault associations: most likely Imperial fault; east strand segment (46%). Alternates: Not associated with a CFM modeled fault (7%), Other CFM faults (47%).*
  • Nearby faults: Imperial fault (0.4 km), Brawley seismic zone (Brawley fault zone) (5.6 km), Brawley seismic zone (8.4 km), San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (11.8 km) and San Jacinto fault zone, Superstition Hills section (Wienert fault) (11.9 km).**

Additional Information


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

]]> ../../../../index.php/2024/05/18/05-18-2024-m3-7-swarm-near-brawley/feed/ 0 04/19/2022, M3.7 swarm near Brawley ../../../../index.php/2022/04/19/04-19-2022-m3-9-near-brawley/index.html ../../../../index.php/2022/04/19/04-19-2022-m3-9-near-brawley/#respond Tue, 19 Apr 2022 20:49:42 +0000 http://www.scsn.org/?p=4316 …
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]]> Significant Events

  • Largest event: M3.7, 19 Apr 2022 13:30:08 PDT, (32.910, -115.513), depth 15.6km. 8km SSE of Brawley, California.
  • As of 21 Apr 2022, 12:34PM PDT, the following event numbers have been recorded in the swarm:
    • M≥3: 6
    • M≥2: 26
  • All M3 events recorded:
    • M 3.6 19 Apr 2022 13:22:41 PDT, (32.910, -115.515), 40241424
    • M 3.7 19 Apr 2022 13:30:08 PDT, (32.910, -115.513), 40241440
    • M 3.3 19 Apr 2022 20:56:46 PDT, (32.915, -115.517), 40241816
    • M 3.4 19 Apr 2022 22:19:44 PDT, (32.917, -115.510), 40241880
    • M 3.3 20 Apr 2022 16:52:47 PDT, (32.917, -115.513), 40242720
    • M 3.6 21 Apr 2022 11:58:50 PDT, (32.892, -115.513), 40243288

Swarm Numbers

  • As of 21 Apr 2022, 12:34PM PDT, we have recorded 60 events in the swarm (within a 20 km radius, and counting 5 days before the largest event). The smallest event is magnitude 1.2. Many of the smaller events are still being analyzed and will be gradually added to the catalogue.
  • More activity is expected in the next few days, swarm activity in Southern California can continue for hours, days, weeks, months or years. For more information on swarms please see our Swarm page.

Historical Seismicity

  • Since our records began in 1932 we’ve had 114 events of M4 or greater within 10km of today’s event.
  • The largest historic event was M6.9 on 1940/05/19.
  • The most recent historic event was M4.0 on 01 Oct 2020.

Faults

  • CFM fault associations: most likely Imperial fault; Edip segment (38%). Alternates: Not associated with a CFM modeled fault (14%), Other CFM faults (48%).*
  • Nearby faults: Imperial fault (2.5 km), Brawley seismic zone (Brawley fault zone) (3.1 km), Brawley seismic zone (4.9 km), San Jacinto fault zone, Superstition Hills section (Wienert fault) (12.6 km) and San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (13.8 km).**

Additional Information


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

**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.

]]> ../../../../index.php/2022/04/19/04-19-2022-m3-9-near-brawley/feed/ 0 01/22/2019, M3.6 near Brawley ../../../../index.php/2019/01/23/01-22-2019-m3-6-near-brawley/index.html ../../../../index.php/2019/01/23/01-22-2019-m3-6-near-brawley/#respond Wed, 23 Jan 2019 21:27:35 +0000 http://www.scsn.org/?p=3060 …
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]]>
  • 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.

    ]]>     ../../../../index.php/2019/01/23/01-22-2019-m3-6-near-brawley/feed/ 0     12/31/2016, Swarm near Brawley (largest M3.9) ../../../../index.php/2017/01/03/12312016-swarm-near-brawley-largest-m3-9/index.html ../../../../index.php/2017/01/03/12312016-swarm-near-brawley-largest-m3-9/#respond Tue, 03 Jan 2017 17:10:03 +0000 http://www.scsn.org/?p=1851 …
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    ]]>
  • A seismic swarm commenced on December 31st, 2016, near Brawley. So far there have been more than 250 events recorded.
  • The largest event in the swarm so far was a M3.9 on 31 Dec 2016 at 15:06:56 PST, (32.975, -115.545), depth 14.5km, 2km WSW of Brawley, California
  • 8 events over M3 have been recorded and more than 80 events over M2. More than 250 events over M0.5 have been recorded.

    • Cumulative number of events over time (top) and event magnitudes over time (bottom) for the swarm near Brawley.


    Map showing events in the swarm near Brawley coloured by time (blue early, red late) and sized by magnitude. The star marks the largest (M3.9) event in the cluster. Faults are shown as grey lines. Historical seismicity above M4.5 is marked by grey stars and magnitude values.

  • 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 was M5.8 (1979/10/16) and the most recent was M4.2 on 28 Aug 2012.
  • Nearby faults: Imperial fault (3.9 km), Brawley seismic zone (Brawley fault zone) (6.7 km), San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (13.6 km) and San Jacinto fault zone, Superstition Hills section (Wienert fault) (14.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
    • ]]>     ../../../../index.php/2017/01/03/12312016-swarm-near-brawley-largest-m3-9/feed/ 0     07/07/2016, M3.8 near Brawley ../../../../index.php/2016/07/07/07072016-m3-8-event-near-brawley/index.html ../../../../index.php/2016/07/07/07072016-m3-8-event-near-brawley/#respond Thu, 07 Jul 2016 13:44:12 +0000 http://www.scsn.org/?p=1568 …
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    ]]>
  • 07 Jul 2016 05:55:24 PDT, (32.912, -115.535), depth 11.1km, 7km S of Brawley, California
  • Aftershocks: so far (08 Jul 2016, 03:18PM PDT) there have been 19 aftershocks recorded, M2.1. 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.
  • Historical seismicity: since our records began in 1932 we’ve had 45 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1979/10/16) and the most recent was M4.3 on 26 Aug 2012.
  • Nearby faults: Imperial fault (0.5 km), Brawley seismic zone (Brawley fault zone) (5.1 km), Brawley seismic zone (6.3 km), San Jacinto fault zone, Superstition Hills section (Wienert fault) (11.2 km) and San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (11.8 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
    • ]]>     ../../../../index.php/2016/07/07/07072016-m3-8-event-near-brawley/feed/ 0     06/21/2016, M3.9 near Brawley ../../../../index.php/2016/06/21/06212016-m3-9-event-near-brawley/index.html ../../../../index.php/2016/06/21/06212016-m3-9-event-near-brawley/#respond Tue, 21 Jun 2016 22:04:46 +0000 http://www.scsn.org/?p=1564 …
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    ]]>
  • 21 Jun 2016 14:55:47 PDT, (32.973, -115.572), depth 14.8km, 4km W of Brawley, California
  • Aftershocks: so far (21 Jun 2016, 03:57PM PDT) there have been 9 aftershocks recorded, the largest M2.4. 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 56 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1979/10/16) and the most recent was M4.2 on 28 Aug 2012.
  • Nearby faults: Imperial fault (4.7 km), Brawley seismic zone (Brawley fault zone) (9.1 km), San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (11.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
    • ]]>     ../../../../index.php/2016/06/21/06212016-m3-9-event-near-brawley/feed/ 0