11/09/2018, M3.8 near Aguanga

Last updated October 4th, 2019

  • Two events above M3.5 have occurred in the ongoing Cahuilla swarm:
    • 09 Nov 2018 06:45:50 PST, (33.483, -116.802), depth 2.0km, 7km NE of Aguanga, California
    • 09 Nov 2018 06:58:09 PST, (33.485, -116.803), depth 1.1km, 7km NE of Aguanga, California
  • Aftershocks: so far (09 Nov 2018, 02:04PM PST) there have been 87 aftershocks recorded since the second, larger event, the largest M2.0 (smallest M0.1). 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 91 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was the M3.7 (2018/11/09).
  • Historical seismicity: since our records began in 1932 we’ve had 14 events of M4 or greater within 10km of today’s event, the largest was M5.6 (2005/06/12) and the most recent was M4.4 on 15 Aug 2018. Since the onset of the Cahuilla swarm in 2016, we have now recorded over 9000 events.
  • Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
  • Visit our special reports page for further information on local notable earthquakes.

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