08/28/2018, M4.4 near La Verne

  • 28 Aug 2018 19:33:28 PDT, (34.137, -117.775), depth 5.5km, 4km N of La Verne, California
  • Aftershocks: so far (29 Aug 2018, 08:05AM PDT) there have been 37 aftershocks recorded, the largest M3.4 (smallest M0.5). 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.
  • Historical seismicity: since our records began in 1932 we’ve had 9 events of M4 or greater within 10km of today’s event, the largest was M5.5 (1990/02/28) and the most recent was M4.5 on 17 Apr 1990.
  • Nearby faults: Sierra Madre fault zone, Sierra Madre E section (Sierra Madre fault) (0.6 km), San Antonio fault (2.5 km), Sierra Madre fault zone, Sierra Madre D section (Sierra Madre fault) (6.5 km), San Jose fault (6.8 km), Sierra Madre fault zone, Sierra Madre D section (Upper Duarte fault) (8.0 km), Stoddard Canyon fault (8.9 km), San Gabriel fault zone, San Gabriel River section (San Gabriel fault) (10.1 km), Sierra Madre fault zone, Cucamonga section (Cucamonga fault) (10.5 km), San Gabriel fault zone, San Gabriel River section (Weber fault) (11.2 km) and Sierra Madre fault zone, Clamshell-Sawpit section (Clamshell-Sawpit Canyon flt) (12.6 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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