04/19/2022, M3.7 swarm near Brawley

Last updated April 21st, 2022

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.

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