SCSNM4.3 – 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 10/26/2017, M4.3 near Lompoc ../../../../index.php/2017/10/26/10262017-m4-3-near-lompoc/ ../../../../index.php/2017/10/26/10262017-m4-3-near-lompoc/#respond Thu, 26 Oct 2017 21:55:29 +0000 http://scsn-dev.gps.caltech.edu/?p=2508 ]]>
  • 26 Oct 2017 13:38:51 PDT, (34.435, -120.670), depth 3.1km, 30km SW of Lompoc, California
  • Aftershocks: so far (26 Oct 2017, 02:52PM PDT) there have been 2 aftershocks recorded, the largest M2.1 (smallest M1.5). 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 4 events of M4 or greater within 10km of today’s event, the largest was M4.7 (1959/10/01) and the most recent was M4.0 on 09 Jan 1989.
  • Nearby faults: Santa Lucia Bank fault zone (9.1 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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    09/26/2016, M4.3 near Bombay Beach ../../../../index.php/2016/09/26/09262016-m4-3-event-near-bombay-beach/ ../../../../index.php/2016/09/26/09262016-m4-3-event-near-bombay-beach/#respond Mon, 26 Sep 2016 15:18:21 +0000 http://scsn-dev.gps.caltech.edu/?p=1717 ]]>
  • These events are the largest so far in a swarm that started on 26 Sep 2016, 04:03AM PDT, and is occurring in the Brawley Seismic Zone near the southern terminus of the San Andreas Fault.
    • M4.3, 26 Sep 2016 07:31:08 PDT, (33.298, -115.713), depth 2.4km, 6km SSE of Bombay Beach, California
    • M4.3, 26 Sep 2016 20:23:58 PDT, (33.300, -115.712), depth 4.8km, 6km SSE of Bombay Beach, California
    • M4.1, 26 Sep 2016 20:36:15 PDT, (33.305, -115.702), depth 2.5km, 6km SSE of Bombay Beach, California
  • This swarm is noteworthy because it is happening near the southern terminus of the San Andreas Fault. This is the same are as the two previous swarms in this region, which occurred in 2009 and 2001. No swarms prior to 2001 with a M4.0 have been recorded in the area since 1933.
  • Events in the swarm show a NE-SW trend, consistent with the 2009 and 2001 swarms. This trend is in alignment with the faults located in the northern Brawley Seismic Zone, and orthogonal to the San Andreas fault. Before 2001, there were few events that had occurred in the northern Brawley Seismic Zone. The southern Brawley Seismic Zone is much more active, with events occurring on a regular basis. More information on the Brawley Seismic Zone and nearby faults can be found in the special report on the 2009 swarm.
  • The swarm includes more than 290 events so far (30 Sep 2016, 12:05PM PDT) in the magnitude range M0.7 to M4.3, there have been 17 events with magnitude greater than M3 and 97 events with magnitude greater than M2. The M4.3 exhibited strike-slip motion with one nodal plane at N47E, and the other sub-parallel to the strike of the San Andreas Fault. Relocations of these events show that the are located in the depth range 4 to 9 km.
    • The 2009 swarm had two large strike-slip events: M4.8 and M4.0.
    • The 2001 swarm had two large strike-slip events: M4.1 and M3.4.
    Relocated events for the Sep 2016 Brawley swarm.

    Brawley swarm 2016 relocations

    Relocated events for the Sep 2016 Brawley swarm shown with the swarms from 2001 and 2009.

    Brawley swarm 2016 relocations with 2001 and 2009 swarms

    Cumulative event rate for the Sep 2016 Brawley swarm.

    Brawley swarm 2016 rate

  • There were 4 events during the 3 days prior to the earthquake (within a 1 km radius), the largest was M3.3 (2016/09/26).
  • Historical seismicity: since our records began in 1932 we’ve had 8 events of M4 or greater within 10km of today’s event, the largest was M4.8 (2009/03/24) and the most recent was M4.8 on 24 Mar 2009.
  • Nearby faults: Brawley Seismic Zone faults (orthogonal to San Andreas fault), San Andreas fault zone, Coachella section (5.8 km) and Hot Springs fault (10.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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    02/19/2016, M4.3 near Lucerne Valley ../../../../index.php/2016/02/20/02192016-m4-3-event-near-lucerne-valley/ ../../../../index.php/2016/02/20/02192016-m4-3-event-near-lucerne-valley/#respond Sat, 20 Feb 2016 06:34:29 +0000 http://www.scsn.org/?p=1417 ]]>
  • 19 Feb 2016 22:13:20 PST, (34.610, -116.628), depth 6.7km, 36km ENE of Lucerne Valley, California
  • Aftershocks: so far (22 Feb 2016, 12:08PM PST) there have been 11 aftershocks recorded, the largest M2.0. 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 10 events of M4 or greater within 10km of today’s event, the largest was M4.6 (1992/10/02) and the most recent was M4.2 on 15 Jul 2003.
  • Nearby faults: Camp Rock-Emerson-Copper Mountain fault zone, Emerson section (0.2 km), Johnson Valley fault, northern Johnson Valley section (Johnson Valley fault) (8.2 km), Calico-Hidalgo fault zone, west Calico section (West Calico fault) (9.6 km), Lenwood-Lockhart fault zone, Lenwood section (Lenwood fault) (13.2 km), Homestead Valley fault zone (13.5 km) and Rodman fault (16.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
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    12/27/2015, M4.3 near Johannesburg ../../../../index.php/2015/12/27/12272015-m4-3-event-near-johannesburg/ ../../../../index.php/2015/12/27/12272015-m4-3-event-near-johannesburg/#respond Sun, 27 Dec 2015 19:02:17 +0000 http://www.scsn.org/?p=1291 ]]>
  • 27 Dec 2015 10:31:17 PST, (35.215, -117.280), depth 0.7km, 37km ESE of Johannesburg, California
  • Aftershocks: so far (04 Jan 2016) there have been 9 aftershocks recorded, the largest M2.3. 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 M3.8 (2015/12/26). See the earlier post for details.
  • Historical seismicity: since our records began in 1932 we’ve had 3 events of M4 or greater within 10km of today’s event, the largest was M4.7 (1992/06/29) and the most recent was M4.1 on 30 Jun 1992.
  • Nearby faults: Blackwater fault zone (Blackwater fault) (4.7 km), Harper fault zone (Black Mountain fault) (5.1 km), Harper fault zone (Gravel Hills fault) (6.8 km), Harper fault zone (Harper Valley fault) (8.5 km), Blackwater fault zone (9.1 km) and Harper fault zone (Cuddeback fault) (10.9 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
  • ]]>
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    11/13/2015, M4.3 near Maneadero, MX ../../../../index.php/2015/11/13/11132015-m4-3-event-near-maneadero-mx/ ../../../../index.php/2015/11/13/11132015-m4-3-event-near-maneadero-mx/#respond Fri, 13 Nov 2015 20:35:45 +0000 http://www.scsn.org/?p=1229 ]]>
  • 13 Nov 2015 09:17:17 PST, (31.613, -116.015), depth 5.4km, 53km ESE of Maneadero, 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 18 events of M4 or greater within 10km of today’s event, the largest was M4.9 (1959/07/17) and the most recent was M4.2 on 15 Feb 2005.
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
  • ]]>
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