12/20/2015, M3.4 near Newport Beach

Last updated October 4th, 2019

  • 20 Dec 2015 15:22:32 PST, (33.625, -117.902), depth 9.5km, 3km ENE of Newport Beach, California
  • Aftershocks: so far (23 Dec 2015) there have been 3 aftershocks recorded, the largest M2.8. 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 14 events of M4 or greater within 10km of today’s event, the largest was M6.4 (1933/03/11) and the most recent was M4.8 on 07 Apr 1989.
  • Nearby faults: Pelican Hill fault (3.0 km), Newport-Inglewood-Rose Canyon fault zone, South Los Angeles basin section (3.1 km), Newport-Inglewood-Rose Canyon fault zone, Dana Point section (3.3 km) and THUMS-Huntington Beach (8.8 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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