SCSNJennifer Andrews – SCSN http://www.scsn.org Southern California Seismic Network Tue, 21 Aug 2018 17:53:51 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.2 08/14/2018, M4.4 near Aguanga ../../../../index.php/2018/08/15/08-14-2018-m4-4-near-aguanga/ ../../../../index.php/2018/08/15/08-14-2018-m4-4-near-aguanga/#respond Wed, 15 Aug 2018 01:42:19 +0000 http://www.scsn.org/?p=2847 ]]>
  • 14 Aug 2018 18:24:26 PDT, (33.477, -116.803), depth 1.9km, 7km NE of Aguanga, California
  • Aftershocks: so far (16 Aug 2018, 10:48AM PDT) there have been 435 aftershocks recorded, the largest M2.9 (smallest M0.0). 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.
  • There were 95 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M2.3 (2018/08/12). This area has been experiencing swarm activity for over 2 years (referred to as Cahuilla swarm), seeing elevated seismicity rates since early 2016. This region has hosted earthquake swarms since the 1980s, each lasting for weeks or a few months. The swarm starting early 2016 is the most prolific swarm recorded, with several thousand events observed so far.
  • 2018 seismicity in the region of the Cahuilla swarm as of 15 August 2018. Circles plot individual earthquakes at all magnitudes in the SCSN catalogue, with size indicating magnitude. Events with magnitude 3.0 or greater are shown as red stars. The red line plots the cumulative number of events with magnitude 1.49 or greater.

    Seismicity in the Cahuilla swarm from 1 day before the M4.4 event to approximately 40 hours after. Top plot shows the cumulative event number and the number of events per 20 minutes, both showing the aftershock event rate decay. Bottom plot shows event magnitudes against time.

  • Historical seismicity: since our records began in 1932 we’ve had 13 events of M4 or greater within 10km of today’s event, the largest was M5.6 (2005/06/12) and the most recent was M4.1 on 17 Nov 2008.
  • 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 to the earthquake shown in the view is CI.HMT2 near Anza-Borrego at approximately 30km from the epicenter.

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    05/01/2018, M3.7 near San Clemente Is ../../../../index.php/2018/05/01/05-01-2018-m3-7-near-san-clemente-is/ ../../../../index.php/2018/05/01/05-01-2018-m3-7-near-san-clemente-is/#respond Tue, 01 May 2018 11:48:01 +0000 http://www.scsn.org/?p=2703 ]]>
  • 01 May 2018 04:22:22 PDT, (32.787, -118.443), depth 8.0km, 10km WSW of San Clemente Is.
  • Aftershocks: so far (01 May 2018, 07:20AM PDT) there have been 3 aftershocks recorded, the largest M3.4 (smallest 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 4 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1951/12/26) and the most recent was M4.2 on 16 Aug 2001.
  • Nearby faults: San Clemente fault zone (San Clemente fault) (11.0 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 Li
    ve Seismograms Feed.The closest station to the earthquake shown in the view is CI.RPV in Long Beach at approximately 106km.

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    04/25/2018, M3.9 near Borrego Springs ../../../../index.php/2018/04/26/04-25-2018-m3-9-near-borrego-springs/ ../../../../index.php/2018/04/26/04-25-2018-m3-9-near-borrego-springs/#respond Thu, 26 Apr 2018 01:44:49 +0000 http://www.scsn.org/?p=2695 ]]>
  • 25 Apr 2018 18:36:00 PDT, (33.380, -116.298), depth 13.9km, 16km NNE of Borrego Springs, California
  • Aftershocks: so far (26 Apr 2018, 02:27PM PDT) there have been 5 aftershocks recorded, the largest M1.2 (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 4 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M2.5 (2018/04/25).
  • Historical seismicity: since our records began in 1932 we’ve had 41 events of M4 or greater within 10km of today’s event, the largest was M6.0 (1937/03/25) and the most recent was M5.2 on 10 Jun 2016.
  • Nearby faults: San Jacinto fault zone, Anza section (Clark fault) (1.1 km), San Jacinto fault zone, Anza section (5.8 km), San Jacinto fault zone, Coyote Creek section (6.6 km), San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (6.8 km) and San Jacinto fault zone, Anza section (Buck Ridge fault) (7.0 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 to the earthquake shown in the view is CI.WWC in Palm Springs at approximately 60km.

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    04/22/2018, M3.9 near Thousand Palms ../../../../index.php/2018/04/23/04-22-2018-m3-9-near-thousand-palms/ ../../../../index.php/2018/04/23/04-22-2018-m3-9-near-thousand-palms/#respond Mon, 23 Apr 2018 01:03:09 +0000 http://www.scsn.org/?p=2683 ]]>
  • 22 Apr 2018 17:46:08 PDT, (33.922, -116.322), depth 8.2km, 13km NNE of Thousand Palms, California
  • Aftershocks: so far (23 Apr 2018, 07:19AM PDT) there have been 7 aftershocks recorded, the largest M2.2 (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.
  • Historical seismicity: since our records began in 1932 we’ve had 85 events of M4 or greater within 10km of today’s event, the largest was M6.1 (1992/04/23) – the Joshua Tree earthquake. The most recent event was M4.0 on 06 Aug 2010.
  • Nearby faults: unnamed Fault in the Little San Bernardino Mountains (1.1 km), Blue Cut fault zone (Blue Cut fault) (2.0 km), Eureka Peak fault (5.4 km), San Andreas fault zone, San Bernardino Mountains section (North Branch SAF) (6.3 km), San Andreas fault zone, San Bernardino Mountains section (6.8 km), Burnt Mountain fault zone (East Wide Canyon fault) (7.1 km), Indio Hills fault zone (8.9 km), San Andreas fault zone, San Bernardino Mountains section (South Branch SAF) (9.3 km) and Long Canyon fault (11.1 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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    04/13/2018, M3.7 near Bodfish ../../../../index.php/2018/04/13/04-13-2018-m3-7-near-bodfish/ ../../../../index.php/2018/04/13/04-13-2018-m3-7-near-bodfish/#respond Fri, 13 Apr 2018 16:09:30 +0000 http://www.scsn.org/?p=2666 ]]>
  • 13 Apr 2018 08:24:46 PDT, (35.392, -118.545), depth 4.8km, 22km SSW of Bodfish, 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.
  • Nearby faults: White Wolf fault zone (White Wolf fault) (10.3 km) and Edison fault (13.4 km). The White Wolf fault was the site of the largest earthquake in southern California since the Fort Tejon event of 1857. Known as the Kern County earthquake, this Mw7.5 event on July 21, 1952 caused widespread damage and was felt across California and Nevada. See the special report on the SCEDC website for more information.
  • Historical seismicity: since our records began in 1932 we’ve had 90 events of M4 or greater within 10km of today’s event, the largest was M5.6 (1952/07/31) and the most recent was M4.2 on 19 Apr 2014. Many of these events are aftershocks of the 1952 Kern County earthquake.
  • 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 to the event shown is Bakersfield (BAK) at 50km.

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    04/05/2018, M5.3 near Santa Cruz Is ../../../../index.php/2018/04/05/04-05-2018-m5-3-near-santa-cruz-is/ ../../../../index.php/2018/04/05/04-05-2018-m5-3-near-santa-cruz-is/#respond Thu, 05 Apr 2018 20:19:32 +0000 http://www.scsn.org/?p=2657 ]]>
  • 05 Apr 2018 12:29:16 PDT, (33.837, -119.725), depth 9.9km, 29km SW of Santa Cruz Is.
  • Foreshocks:No earthquakes were detected within 20 km of this earthquake in the preceding week. This is not unusual and is a reminder that earthquakes often occur without any previous short-term seismic activity.
  • 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.
  • The earthquake occurred on an offshore strike-slip fault; further analysis will be needed to identify the fault or fault system with which it is associated. An earthquake of this size is not necessarily associated with a major, named fault. Nearby faults: Santa Cruz Island fault (14.2 km). The strike slip mechanism is shown below.
    Moment tensor solution for the 05 Apr 2018 earthquake near Santa Cruz Is.

  • Historic seismicity: two earthquakes with magnitudes of 4-5 have occurred in the general region since 1940 (M4.8 in 1954/08/26 and M4.1 2005/07/24). On December 21, 1812, a large earthquake struck in the Santa Barbara Channel, generating a tsunami that carried a ship inland. This earthquake is poorly understood due to its timing, but illustrates that offshore faults are capable of hosting earthquakes with magnitudes upwards of 7. On June 29, 1925, a magnitude 6.6 earthquake occurred offshore of Santa Barbara.
  • The earthquake was widely felt along the California coast as shown in the felt report plot below. Anything more than light shaking would only be expected on the channel islands, close to the epicenter.

    Instrumental shaking is shown in the ShakeMap below.

  • 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 to the epicenter represented below is CI.LCP in Santa Maria, at a distance of 112 km from the event. The furthest station shown is CI.MLAC in Mammoth Lakes, over 400 km away. With an event of this magnitude, and the sensitivity of our seismic instruments, we detect this earthquake across our entire seismic network.

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    02/26/2018, M3.7 near Anza ../../../../index.php/2018/02/26/02-26-2018-m3-8-near-anza/ ../../../../index.php/2018/02/26/02-26-2018-m3-8-near-anza/#respond Mon, 26 Feb 2018 18:55:08 +0000 http://www.scsn.org/?p=2604 ]]>
  • 26 Feb 2018 10:44:41 PST, (33.483, -116.503), depth 12.6km, 18km ESE of Anza, California
  • Aftershocks: so far (28 Feb 2018, 08:47AM PST) there have been 17 aftershocks recorded, the largest M1.9 (smallest M0.5). 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.
  • There were 25 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M1.5 (2018/02/23).
  • Historical seismicity: since our records began in 1932 we’ve had 26 events of M4 or greater within 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) (0.2 km), San Jacinto fault zone, Anza section (1.6 km), San Jacinto fault zone, Coyote Creek section (Coyote Creek fault) (3.1 km), San Jacinto fault zone, Anza section (Buck Ridge fault) (3.1 km) and San Jacinto fault zone, Coyote Creek section (6.0 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 the feed below are CI.WWC and CI.HMT2 at 51.7km and 52.5km away from the epicenter respectively.

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    01/14/2018, M3.7 near Ludlow ../../../../index.php/2018/01/14/01142018-m3-7-near-ludlow/ ../../../../index.php/2018/01/14/01142018-m3-7-near-ludlow/#respond Sun, 14 Jan 2018 20:06:49 +0000 http://www.scsn.org/?p=2551 ]]>
  • 14 Jan 2018 11:56:11 PST, (34.817, -116.073), depth 4.2km, 13km NE of Ludlow, 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 2 events of M4 or greater within 10km of today’s event, the largest was M4.5 (1938/08/18) and the most recent was M4.1 on 09 Nov 1942.
  • Nearby faults: Ludlow fault (10.6 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 to the event is CI.WWC at approximately 100km, and the furthest is CI.MLAC at more than 400km.

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    01/06/2018, M3.8 near Isla Vista ../../../../index.php/2018/01/07/01062018-m3-8-near-isla-vista/ ../../../../index.php/2018/01/07/01062018-m3-8-near-isla-vista/#respond Sun, 07 Jan 2018 01:43:35 +0000 http://www.scsn.org/?p=2548 ]]>
  • 06 Jan 2018 17:31:10 PST, (34.400, -120.025), depth 2.3km, 15km W of Isla Vista, 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 4 events of M4 or greater within 10km of today’s event, the largest was M4.8 (2013/05/29) and the most recent was M4.1 on 17 May 2017.
  • Nearby faults: Glen Annie fault (11.1 km) and Mission Ridge fault system, More Ranch section (More Ranch fault) (11.7 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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    12/06/2017, M4.0 near Julian ../../../../index.php/2017/12/07/12062017-m4-0-near-julian/ ../../../../index.php/2017/12/07/12062017-m4-0-near-julian/#respond Thu, 07 Dec 2017 02:27:48 +0000 http://www.scsn.org/?p=2529 ]]>
  • A number of felt earthquakes have occurred near Julian, California, four with magnitude three or above:
    • M4.0, 06 Dec 2017 16:33:15 PST, (33.148, -116.480), depth 11.1km, 14km NE of Julian, California
    • M3.0, 06 Dec 2017 16:38:03 PST, (33.150, -116.482), depth 11.1km, 14km NE of Julian, California
    • M3.6, 06 Dec 2017 19:57:38 PST, (33.150, -116.480), depth 11.4km, 14km NE of Julian, California
    • M3.5, 07 Dec 2017 02:32:47 PST, (33.147, -116.478), depth 11.0km, 14km ENE of Julian, California
  • Aftershocks: so far (07 Dec 2017, 08:00AM PST) there have been 76 aftershocks recorded for the M4.0 event, the largest M3.6 (smallest M0.6). 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.
  • Cumulative event number against time (top) and magnitude against time (bottom) for the events near Julian on 6-7 December 2017. In the lower plot, red stars mark the four events with magnitude three or above.
  • There were 3 events during the 3 days prior to the earthquake (within a 15 km radius), the largest was M2.6 (2017/12/07).
  • Historical seismicity: since our records began in 1932 we’ve had 9 events of M4 or greater within 10km of today’s event, the largest was M4.7 (1957/01/24) and the most recent was M4.5 on 10 Oct 1984.
  • Nearby faults: Elsinore fault zone, Julian section (Earthquake Valley fault) (3.5 km), Elsinore fault zone, Earthquake Valley fault, Julian section (4.3 km) and Elsinore fault zone, Julian section (Elsinore fault) (10.0 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 to the event is CI.DGR at approximately 75km, and the furthest is CI.MLAC at more than 500km.

    Below is a playlist of the waveform data associated with this sequence, as recorded in our Live Seismograms Feed. The closest station shown to the event is CI.DGR at approximately 75km, and the furthest is CI.MLAC at more than 500km. More videos may be added as new events occur.

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