07/31/2016, M4.0 near Westmorland

Last updated October 4th, 2019

  • 31 Jul 2016 09:21:05 PDT, (32.958, -115.760), depth 3.2km, 16km SW of Westmorland, California
  • Aftershocks: so far there have been no aftershocks recorded. Some 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 1 km radius), the largest was M2.6 (2016/07/31).
  • Historical seismicity: since our records began in 1932 we’ve had 15 events of M4 or greater within 10km of today’s event, the largest was M6.6 (1942/10/21) and the most recent was M4.7 on 28 Jan 1988.
  • Nearby faults: Superstition Hills flt, 1.3 km; Superstition Mountain section fault, 3.7 km; Lone Tree fault, 8.3 km; Wienert fault, 9.9 km; East Elmore Ranch fault, 10.7 km; and Elmore Ranch fault, 10.8 km; all within the Superstition Hills section of the San Jacinto fault zone.
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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