SCSNM3.9 – 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 10/24/2017, M3.9 near San Clemente Is ../../../../index.php/2017/10/24/10242017-m3-9-near-san-clemente-is/ ../../../../index.php/2017/10/24/10242017-m3-9-near-san-clemente-is/#respond Tue, 24 Oct 2017 13:40:59 +0000 http://scsn-dev.gps.caltech.edu/?p=2320 ]]>
  • 24 Oct 2017 00:00:51 PDT, (33.173, -118.722), depth 4.8km (fixed), 19km NW of San Clemente Is.
  • 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.
  • Historical seismicity: since our records began in 1932 we’ve had 1 events of M4 or greater within 10km of today’s event, the largest and most recent was M4.1 on 21 Oct 1932.
  • Nearby faults: San Clemente fault zone (San Clemente fault) (3.5 km) and Santa Cruz_Santa Catalina Ridge fault zone (21.7 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. The closest stations represented in this display are CI.RPV and CI.DJJ at 70km and 107km away from the epicenter.

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    07/20/2017, M3.9 near El Sauzal ../../../../index.php/2017/07/20/07202017-m3-9-event-near-el-sauzal/ ../../../../index.php/2017/07/20/07202017-m3-9-event-near-el-sauzal/#respond Thu, 20 Jul 2017 20:05:04 +0000 http://scsn-dev.gps.caltech.edu/?p=2235 ]]>
  • 20 Jul 2017 12:42:21 PDT, (31.847, -117.090), depth 13.0km, 39km W of El Sauzal, B.C., Mexico
  • 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.
  • Historical seismicity: since our records began in 1932 we’ve had 1 events of M4 or greater within 10km of today’s event, the largest was M4.2 (1995/01/29) and the most recent was M4.2 on 29 Jan 1995.
  • 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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    12/31/2016, Swarm near Brawley (largest M3.9) ../../../../index.php/2017/01/03/12312016-swarm-near-brawley-largest-m3-9/ ../../../../index.php/2017/01/03/12312016-swarm-near-brawley-largest-m3-9/#respond Tue, 03 Jan 2017 17:10:03 +0000 http://scsn-dev.gps.caltech.edu/?p=1851 ]]>
  • A seismic swarm commenced on December 31st, 2016, near Brawley. So far there have been more than 250 events recorded.
  • The largest event in the swarm so far was a M3.9 on 31 Dec 2016 at 15:06:56 PST, (32.975, -115.545), depth 14.5km, 2km WSW of Brawley, California
  • 8 events over M3 have been recorded and more than 80 events over M2. More than 250 events over M0.5 have been recorded.
  • Cumulative number of events over time (top) and event magnitudes over time (bottom) for the swarm near Brawley.



    Map showing events in the swarm near Brawley coloured by time (blue early, red late) and sized by magnitude. The star marks the largest (M3.9) event in the cluster. Faults are shown as grey lines. Historical seismicity above M4.5 is marked by grey stars and magnitude values.


  • Historical seismicity: since our records began in 1932 we’ve had 22 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1979/10/16) and the most recent was M4.2 on 28 Aug 2012.
  • Nearby faults: Imperial fault (3.9 km), Brawley seismic zone (Brawley fault zone) (6.7 km), San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (13.6 km) and San Jacinto fault zone, Superstition Hills section (Wienert fault) (14.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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    06/21/2016, M3.9 near Brawley ../../../../index.php/2016/06/21/06212016-m3-9-event-near-brawley/ ../../../../index.php/2016/06/21/06212016-m3-9-event-near-brawley/#respond Tue, 21 Jun 2016 22:04:46 +0000 http://scsn-dev.gps.caltech.edu/?p=1564 ]]>
  • 21 Jun 2016 14:55:47 PDT, (32.973, -115.572), depth 14.8km, 4km W of Brawley, California
  • Aftershocks: so far (21 Jun 2016, 03:57PM PDT) there have been 9 aftershocks recorded, the largest M2.4. 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 56 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1979/10/16) and the most recent was M4.2 on 28 Aug 2012.
  • Nearby faults: Imperial fault (4.7 km), Brawley seismic zone (Brawley fault zone) (9.1 km), San Jacinto fault zone, Superstition Hills section (Superstition Hills flt) (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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    02/16/2016, M3.9 near Big Bear City ../../../../index.php/2016/02/16/02162016-m3-9-event-near-big-bear-city/ ../../../../index.php/2016/02/16/02162016-m3-9-event-near-big-bear-city/#respond Tue, 16 Feb 2016 15:08:29 +0000 http://www.scsn.org/?p=1406 ]]>
  • 16 Feb 2016 01:24:20 PST, (34.303, -116.863), depth 3.1km, 5km NNW of Big Bear City, California
  • Aftershocks: so far (17 Feb 2016, 02:27PM PST) there have been 44 aftershocks recorded, the largest M2.6. 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 5 events during the 3 days prior to the earthquake (within a 1 km radius), the largest was M2.4 (2016/02/16).
  • The figure shows the cumulative event rate as well as magnitude against time for the sequence.
  • caeqtimes

  • Historical seismicity: since our records began in 1932 we’ve had 49 events of M4 or greater within 10km of today’s event, the largest was M5.3 (1992/11/27) and the most recent was M4.2 on 03 Dec 2005.
  • The figure shows the historic seismicity as grey stars and the recent sequence as circles, coloured by the time of occurrence (blue early, red late) and sized by magnitude. The main M3.9 event is shown as a black star. Red lines indicate the fault traces and the town of Big Bear is marked by a green triangle.
  • caeqplot

  • Nearby faults: Helendale-South Lockhart fault zone, northern San Bernardino Mountains section (3.6 km), North Frontal thrust system, western section (White Mountains thrust) (5.2 km), North Frontal thrust system, eastern section (6.4 km), Helendale-South Lockhart fault zone, Helendale section (Helendale fault) (7.4 km), Santa Ana fault zone (Santa Ana fault) (12.6 km) and Silver Reef fault (12.8 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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