02/12/2021, M4.0 near Olancha


  • 12 Feb 2021 15:57:13 PST, (36.218, -117.927), depth 3.1km.
  • 10km SE of Olancha, California


  • As of 12 Feb 2021, 09:40PM PST, there have been 15 aftershocks recorded.
  • The largest was M3.0 (smallest M0.9).
  • 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 2 events during the 3 days prior to the earthquake (within a 10 km radius).
  • The largest was M1.7 (2021/02/11).

Historical Seismicity

  • Since our records began in 1932 we’ve had 30 events of M4 or greater within 10km of today’s event.
  • The largest historic event was M5.2 on 2009/10/03.
  • The most recent historic event was M4.0 on 17 Jan 2021.


  • CFM fault associations: most likely Independance; Sierra Nevada fault segment (80%). Alternates: Not associated with a CFM modeled fault (20%).*
  • Nearby faults: unnamed faults south side Owens Lake (1.9 km), Owens Valley fault zone, 1872 rupture section (5.2 km) and Southern Sierra Nevada fault zone, Haiwee Reservoir section (8.1 km).**

Additional Information

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

SCSN: Caltech/USGS Southern California Seismic Network

**Earthquakes can occur both near or on major known faults, and in places where no clear fault zones are known. 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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