SCSNM4.0 – SCSN http://scsn-dev.gps.caltech.edu Southern California Seismic Network Thu, 16 Nov 2017 19:57:09 +0000 en-US hourly 1 https://wordpress.org/?v=4.7.2 03/22/2017, M4.0 near Alberto Oviedo Mota ../../../../index.php/2017/03/22/03222017-m4-0-event-near-alberto-oviedo-mota/ ../../../../index.php/2017/03/22/03222017-m4-0-event-near-alberto-oviedo-mota/#respond Wed, 22 Mar 2017 20:40:24 +0000 http://scsn-dev.gps.caltech.edu/?p=2112 ]]>
  • 22 Mar 2017 11:57:32 PDT, (32.225, -115.228), depth 18.5km, 6km W of Alberto Oviedo Mota, B.C., Mexico
  • Aftershocks: so far (22 Mar 2017, 01:26PM PDT) there has been 1 aftershock recorded, M3.8. 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 93 events of M4 or greater within 10km of today’s event, the largest was M7.2 (2010/04/04) and the most recent was M4.1 on 17 Apr 2013.
  • 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. The closest station shown here is CI.RXH, approximately 113 km from the epicenter.

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    12/28/2016, M4.0 near Morongo Valley ../../../../index.php/2016/12/28/12282016-m4-0-event-near-morongo-valley/ ../../../../index.php/2016/12/28/12282016-m4-0-event-near-morongo-valley/#respond Wed, 28 Dec 2016 18:09:13 +0000 http://scsn-dev.gps.caltech.edu/?p=1846 ]]>
  • 28 Dec 2016 09:56:59 PST, (34.152, -116.707), depth 10.1km, 16km NW of Morongo Valley, California
  • Aftershocks: so far there have been 7 aftershocks recorded. 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 2 events of M4 or greater within 10km of today’s event, the largest was M4.8 (30 Jun 1992).
  • Nearby faults: Santa Ana fault zone (Santa Ana fault) (4.2 km), Pinto Mountain fault zone (Pinto Mountain fault) (8.6 km), San Gorgonio Mountain fault (8.9 km), Helendale-South Lockhart fault zone, northern San Bernardino Mountains section (9.0 km), San Andreas fault zone, San Bernardino Mountains section (Mill Creek fault) (9.9 km), Pipes Canyon fault (10.3 km) and San Andreas fault zone, San Bernardino Mountains section (Mission Creek fault) (11.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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    07/31/2016, M4.0 near Westmorland ../../../../index.php/2016/08/02/07312016-m4-0-event-near-westmorland/ ../../../../index.php/2016/08/02/07312016-m4-0-event-near-westmorland/#respond Tue, 02 Aug 2016 20:29:46 +0000 http://scsn-dev.gps.caltech.edu/?p=1596 ]]>
  • 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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    9/16/2015, M4.0 Near Big Bear Lake ../../../../index.php/2015/09/23/16-september-2015-m4-0-event-near-big-bear-lake/ ../../../../index.php/2015/09/23/16-september-2015-m4-0-event-near-big-bear-lake/#respond Wed, 23 Sep 2015 19:31:53 +0000 http://scsn-dev.gps.caltech.edu/?p=1145 ]]>
  • 16 Sep 2015 09:10:47 PDT, (34.139, -116.857), 13km SSE of Big Bear Lake, CA.
  • Initial magnitude was revised to M4.0 once all data became available and were analyzed.
  • Depth was about 11km (7 miles), and the event was widely felt (out to ~200km) with light to moderate shaking at the epicenter.
  • So far there have been a few small aftershocks: two over M2.0, the first within a few minutes of the M4.0. More may be expected, largest could be M3.0 if the M4.0 is the mainshock. There is a small chance (about 5%) that a larger quake could occur, with the likelihood decreasing over time.
  • Focal mechanism and moment tensor solutions for the M4.0 show oblique normal motion. It is not possible to say exactly which fault at this time; local geology is complex and several large fault systems converge near this area (San Andreas, Pinto Mountain are within a few miles).
  • Events have occurred in this area historically, since our records began in 1932 we’ve had 22 events of M4 or greater within 10km of today’s event, the last was an M4.6 on 1 Oct 1995, many were aftershocks of the Landers earthquake in 1992.
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