09/30/2018, M3.6 near Calimesa

Last updated October 4th, 2019

  • 30 Sep 2018 07:41:29 PDT, (34.002, -117.018), depth 16.3km, 4km ENE of Calimesa, California
  • Aftershocks: so far (01 Oct 2018, 08:10AM PDT) there have been 5 aftershocks recorded, the largest M1.4 (smallest M0.7). 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 2 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M1.0 (2018/09/28).
  • Historical seismicity: since our records began in 1932 we’ve had 21 events of M4 or greater within 10km of today’s event, the largest was M4.9 (2005/06/16) and the most recent was M4.4 on 06 Jan 2016.
  • Nearby faults: San Gorgonio Pass fault zone (San Gorgonio Pass fault) (1.3 km), San Andreas fault zone, San Bernardino Mountains section (Banning fault) (3.5 km), Beaumont Plain fault zone (4.4 km), Crafton Hills fault zone (Chicken Hill fault) (5.2 km),
  • 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.

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