02/01/2020, M3.6 near Anza


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


  • 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.


  • 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

**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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