SCSNby Dr. Jennifer Andrews – 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 11/09/2017, M3.5 near Anza ../../../../index.php/2017/11/10/11092017-m3-5-near-anza/ ../../../../index.php/2017/11/10/11092017-m3-5-near-anza/#respond Fri, 10 Nov 2017 01:56:08 +0000 http://scsn-dev.gps.caltech.edu/?p=2516 ]]>
  • 09 Nov 2017 16:23:30 PST, (33.462, -116.467), depth 7.4km, 22km ESE of Anza, California
  • Aftershocks: so far (09 Nov 2017, 05:53PM PST) there have been 5 aftershocks recorded, the largest M1.5 (smallest M0.8). 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.
  • There were 29 events during the 3 days prior to the earthquake (within a 15 km radius), the largest was M3.1 (2017/11/09).
  • Historical seismicity: since our records began in 1932 we’ve had 34 events of M4 or greater with in 10km of today’s event, the largest was M5.6 (2005/06/12) and the most recent was M5.2 on 10 Jun 2016.
  • Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (0.4 km), San Jacinto fault zone, Anza section (0.4 km), San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (3.2 km), San Jacinto fault zone, Coyote Creek section (3.5 km) and San Jacinto fault zone, Anza section (Buck Ridge fault) (4.3 km).
  • Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
  • Visit our special reports page for further information on local notable earthquakes.
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    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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    05/16/2017, M4.1 near Isla Vista ../../../../index.php/2017/05/17/05162017-m4-1-event-near-isla-vista/ ../../../../index.php/2017/05/17/05162017-m4-1-event-near-isla-vista/#respond Wed, 17 May 2017 05:02:58 +0000 http://scsn-dev.gps.caltech.edu/?p=2182 ]]>
  • 16 May 2017 21:42:25 PDT, (34.420, -120.002), depth 2.2km, 13km W of Isla Vista, California
  • Aftershocks: so far (17 May 2017, 08:29AM PDT) there have been 6 aftershocks recorded, the largest M3.0 (smallest M1.8). 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 3 events of M4 or greater within 10km of today’s event, the largest was M4.8 (2013/05/29) and the most recent was M4.8 on 29 May 2013.
  • Nearby faults: Glen Annie fault (8.6 km), Mission Ridge fault system, More Ranch section (More Ranch fault) (9.8 km), San Pedro fault (13.9 km), Santa Ynez fault zone, western section (14.0 km) and San Jose fault (14.6 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. The closest station shown here is CI.SYP, approximately 12 km from the epicenter, and CI.LCP, approximately 43 km from the epicenter.

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    03/14/2017, M3.6 near Salton City ../../../../index.php/2017/03/14/03142017-m3-6-event-near-salton-city/ ../../../../index.php/2017/03/14/03142017-m3-6-event-near-salton-city/#respond Tue, 14 Mar 2017 17:24:04 +0000 http://scsn-dev.gps.caltech.edu/?p=2084 ]]>
  • 14 Mar 2017 10:14:05 PDT, (33.238, -116.053), depth 5.2km, 11km SW of Salton City, 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.
  • Historical seismicity: since our records began in 1932 we’ve had 42 events of M4 or greater within 10km of today’s event, the largest was M6.6 (1968/04/09) and the most recent was M4.3 on 09 Feb 2007.
  • Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (10.1 km), San Jacinto fault zone, Borrego Mountain section (Coyote Creek fault) (11.7 km) and San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (13.8 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 station shown here is CI.RXH, approximately 40 km from the epicenter, while the furthest stations (e.g. CI.VOG, CI.PHL) are over 450 km from the epicenter (no clear earthquake signal recorded).

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    03/13/2017, M3.6 near Loma Linda ../../../../index.php/2017/03/14/03132017-m3-6-event-near-loma-linda/ ../../../../index.php/2017/03/14/03132017-m3-6-event-near-loma-linda/#respond Tue, 14 Mar 2017 05:33:37 +0000 http://scsn-dev.gps.caltech.edu/?p=2073 ]]>
  • 13 Mar 2017 22:06:54 PDT, (34.038, -117.238), depth 17.6km, 2km ESE of Loma Linda, California
  • Aftershocks: so far (14 Mar 2017, 08:25AM PDT) there have been 2 aftershocks recorded, the largest M0.9 (smallest M0.9). 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 was 1 event during the 3 days prior to the earthquake (within a 15 km radius), with M0.9 (2017/03/12).
  • Historical seismicity: since our records began in 1932 we’ve had 12 events of M4 or greater within 10km of today’s event, the largest was M4.7 (1936/02/23) and the most recent was M4.1 on 13 Feb 2010.
  • Nearby faults: San Jacinto fault zone, San Bernardino section (Loma Linda fault) (0.2 km), Crafton Hills fault zone (Live Oak Canyon fault) (0.9 km), San Jacinto fault zone, San Bernardino section (Claremont fault) (1.4 km), San Jacinto fault zone, San Bernardino section (San Jacinto fault) (3.0 km), Crafton Hills fault zone (Redlands fault) (4.7 km), Crafton Hills fault zone (6.0 km), Crafton Hills fault zone (Reservoir Canyon fault) (6.6 km), San Jacinto fault zone, San Jacinto Valley section (8.7 km), San Jacinto fault zone.
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • 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.RVR, approximately 13.5 km from the epicenter, while the furthest stations (e.g. CI.VOG, CI.PHL) are over 300 km from the epicenter.

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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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    10/31/2016, M3.5 near Niland ../../../../index.php/2016/10/31/10312016-m3-5-event-near-niland/ ../../../../index.php/2016/10/31/10312016-m3-5-event-near-niland/#respond Mon, 31 Oct 2016 16:48:02 +0000 http://scsn-dev.gps.caltech.edu/?p=1799 ]]>
  • 31 Oct 2016 03:41:07 PDT, (33.187, -115.567), depth 3.1km, 7km SW of Niland, California
  • This event is the largest so far in a small cluster of events that started at about 2:30am PDT, consisting of about 35 recorded events. A few events were also recorded in the same area on 26 Oct 2016. A smaller cluster of events also occurred on the 26 Oct 2016 about 3km to the west of the most recent seismicity, giving a total of approximately 50 events over the last 6 days. We have recorded 4 events over M3 and more than 20 events over M2.
  • Current cumulative event rate and magnitudes for the small swarm near Niland.

    NilandSwarmOct2016_rate

  • The events are in the southern section of the Brawley Seismic Zone, a relatively active area for seismicity. Swarms occur relatively frequently, notably the swarms that occurred during the 1970’s and 1980’s in this area made the zone among the most active areas in all of California.
  • Historical seismicity: since our records began in 1932 we’ve had 11 events of M4 or greater within 10km of today’s event, the largest was M5.1 (2005/09/02) and the most recent was M4.2 on 24 Dec 2014.
  • Relocated events for the small swarm near Niland, forming a very tight cluster. Figure provided by Egill Hauksson, Caltech.

    Niland_eqs_31-Oct-2016

    Catalogue events in the current small swarm near Niland coloured by time (blue early, red late) and sized by magnitude. Historic seismicity above M4.5 is marked by a grey star and the event’s magnitude.

    NilandSwarmOct2016_map

  • The following information comes from our special report on the 2005 Obsidian Butte swarm
    • The Brawley Seismic Zone is a north-striking zone of northwest and northeast-striking faults that extends from the southern end of the San Andreas fault to the northern end of the Imperial fault. It is often considered a remnant spreading center in the transition from the Gulf of California mid-ocean ridge to the San Andreas transform fault. Historically, activity includes both northeast-oriented cross-faults that typically involve left-lateral faulting, and activity on northerly to northwesterly-oriented strands (right-lateral faulting) of the zone. The largest events to have occurred on the cross-faults were the Elmore Ranch event in 1987, which is considered to have triggered the Superstition Hills event less than 12 hours later, and the Westmorland event in 1981. The Brawley Seismic Zone is proximal to the southern San Andreas fault, the San Jacinto fault zone, and the Imperial fault.
    • The pattern of Brawley swarms of the 1970’s was a large number of very small earthquakes (sometimes exceeding 10,000 events) with up to a dozen moderate events of magnitude 4 or so, but no clear mainshock larger than the other events. The 1970’s swarms would be highly active for a few days and then taper off over the next week or two.
  • Links for: USGS earthquake page, ShakeMap, DYFI.
  • Visit our special reports page for further information on local notable earthquakes.
  • ]]>
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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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    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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    06/10/2016, M5.2 near Borrego Springs ../../../../index.php/2016/06/10/06102016-m5-2-event-near-borrego-springs/ ../../../../index.php/2016/06/10/06102016-m5-2-event-near-borrego-springs/#respond Fri, 10 Jun 2016 11:33:39 +0000 http://scsn-dev.gps.caltech.edu/?p=1521 ]]> Main facts: 10 June 2016 01:04:38 PDT, (33.432, -116.443), depth 12.3km, 20km NNW of Borrego Springs, California.

    The ground shaking from ShakeMap (instrumental intensity) in the epicentral area was slightly higher than the reported felt intensities from Did You Feel It.

    DYFI (felt) intensities (top) and instrumental Shake map intensities (bottom).

    DYFI_ci37374687

    ShakeMap_ci37374687

    Aftershocks

    So far (10 Jun 2016, 05:43PM PDT) there have been 593 aftershocks recorded, the largest M3.8. More than 30 events have been greater than M2. 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. More information on aftershock probability is available HERE

    Cumulative aftershock count against time, and magnitude-time distribution of aftershocks.

    37374687-caeqtimes-trim

    Catalogue aftershock locations shown coloured by time (blue early, red late) and sized by magnitude. The mainshock is shown by the red star. Historic seismicity above M4 (since 1932) is shown as black stars with the magnitude marked. Fault traces are shown in grey.

    37374687-caeqplot-trim

    Preliminary relocation using HypoDD with a 3D velocity model. The largest dot is the M5.2 mainshock. The USGS fault map is shown in the background.

    ci37374687_borrego_M5.2_map

    Historical Seismicity

    Since our records began in 1932 we’ve had 24 events of M4 or greater within 10km of today’s event, the largest was M5.4 (2010/07/07) and the most recent was M4.7 on 11 Mar 2013.

    Seismicity on the SJF showing the 2016/06/10 mainshock as a blue star, aftershocks to circled in green, events in the week prior circled in blue. All events are coloured by their depth according to the scale shown, and magnitude denoted by size. Focal mechanisms are shown where available showing predominantly right lateral strike slip, with some thrust mechanisms. Fault traces are shown in orange. Figure courtesy of J. Polet.

    ci37374687_map3Plarge

    Historical events along the SJF. The Mw5.2 event was located close to the Ml5.34 1980 event.

    hist_ci37374687

    Faults

    Nearby faults: San Jacinto fault (SJF) zone, Anza section (0.6 km). The San Jacinto is a right-lateral, strike-slip fault, consistent with the moment tensor of this event. The event occurred in close proximity to the Clark fault strand of the SJF at about 12 km (7.5 mi) depth. For this magnitude and depth, surface rupture is not likely so a definitive association with a specific fault strand is not possible at this time. Field surveys will be conducted to investigate the possibility of surface rupture. Spectra of the mainshock suggest rupture to the northwest but the rupture could be mostly bilateral.

    Further Info

    Aftershock Probability Report

    Published on June 10, 2016 @ 08:07:09 UTC

    Southern California Seismic Network (SCSN) operated by Caltech and USGS

    Version 2: This report supersedes any earlier probability reports about this event.

    MAINSHOCK
    Magnitude 5.09 Mlr (A moderate quake)
    Time 10 Jun 2016 01:04:38 AM, PDT
    10 Jun 2016 08:04:38 UTC
    Coordinates 33 deg. 26.54 min. N, 116 deg. 27.06 min. W
    33.4423 N, 116.4510 W
    Depth 7.5 miles ( 12.0 km)
    Quality Excellent
    Location 13 mi. ( 21 km) NNW of Borrego Springs, CA
    26 mi. ( 43 km) S of Palm Springs, CA
    Event ID CI 37374687
    STRONG AFTERSHOCKS (Magnitude 5 and larger)

    At this time (immediately after the mainshock) the probability of a strong and possibly damaging aftershock IN THE NEXT 7 DAYS is less than 10 PERCENT

    EARTHQUAKES LARGER THAN THE MAINSHOCK

    Most likely, the recent mainshock will be the largest in the sequence. However, there is a small chance (APPROXIMATELY 5 TO 10 PERCENT) of an earthquake equal to or larger than this mainshock in the next 7 days.

    WEAK AFTERSHOCKS (Magnitude 3 to 5)

    In addition, approximately 1 to 12 SMALL AFTERSHOCKS are expected in the same 7-DAY PERIOD and may be felt locally.

    This probability report is based on the statistics of aftershocks typical for California. This is not an exact prediction, but only a rough guide to expected aftershock activity. This probability report may be revised as more information becomes available.

    Background Information About Aftershocks

    Like most earthquakes, the recent earthquake is expected to be followed by numerous aftershocks. Aftershocks are additional earthquakes that occur after the mainshock and in the same geographic area. Usually, aftershocks are smaller than the mainshock, but occasionally an aftershock may be strong enough to be felt widely throughout the area and may cause additional damage, particularly to structures already weakened in the mainshock. As a rule of thumb, aftershocks of magnitude 5 and larger are considered potentially damaging.

    Aftershocks are most common immediately after the mainshock; their average number per day decreases rapidly as time passes. Aftershocks are most likely to be felt in the first few days after the mainshock, but may be felt weeks, months, or even years afterwards. In general, the larger the mainshock, the longer its aftershocks will be felt.

    Aftershocks tend to occur near the mainshock, but the exact geographic pattern of the aftershocks varies from earthquake to earthquake and is not predictable. The larger the mainshock, the larger the area of aftershocks. While there is no “hard” cutoff distance beyond which an earthquake is totally incapable of triggering an aftershock, the vast majority of aftershocks are located close to the mainshock. As a rule of thumb, a magnitude 6 mainshock may have aftershocks up to 10 to 20 miles away, while a magnitude 7 mainshock may have aftershocks as far as 30 to 50 miles away.

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