SCSNGrapevine – SCSN

10/12/2022, M3.7 near Grapevine

Gabrielle Tepp — Wed, 12 Oct 2022 21:43:00 +0000

Event

12 Oct 2022 05:54:07 PDT, (35.048, -118.995), depth 12.3km.
13km NNW of Grapevine, California

Aftershocks

As of 12 Oct 2022, 02:31PM PDT, there have been 8 aftershocks recorded.
The largest was M2.0 (smallest M1.0).
More aftershocks 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.

Possible Foreshocks

There were 2 events during the 3 days prior to the earthquake (within a 10 km radius).

Historical Seismicity

Since our records began in 1932 we’ve had 110 events of M4 or greater within 10km of today’s event.
The largest historic event was M7.5 on 1952/07/21.
The most recent historic event was M4.2 on 22 Sep 2005.

Faults

CFM fault associations: most likely White Wolf fault (79%). Alternates: Not associated with a CFM modeled fault (21%).*
Nearby faults: Wheeler Ridge fault zone (Wheeler Ridge fault) (2.1 km), unnamed faults (1952 earthquake fractures) (4.3 km), Pleito fault zone, western Pleito section (Pleito fault) (6.6 km) and Pleito fault zone, eastern Pleito section (Pleito fault) (7.2 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.
Visit scedc.caltech.edu to access any data recorded by the SCSN.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed.

*Earthquakes can occur both near or on major known faults, and in places where no clear fault zones are known. Using the statistical method of Evans et al. (in prep. 2019) the location and focal mechanism of this earthquake suggest the above association with modeled faults in the Community Fault Model (CFM) provided by the Southern California Earthquake Center (SCEC) and Harvard University. Note that the CFM fault association may be different from the nearby faults list. Differences may arise due to different fault databases, and because the CFM fault association uses the hypocenter with relation to subsurface 3-dimensional fault orientation models, while the nearby faults list utilizes mapped surface traces as they relate to the epicenter.

CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth & Planetary Sciences.

Probability: The probability in percent the earthquake is associated with this fault.

SCSN: Caltech/USGS Southern California Seismic Network

**U.S. Geological Survey and California Geological Survey, 2006, Quaternary fault and fold database for the United States, accessed 2015, from USGS web site: https://earthquake.usgs.gov/hazards/qfaults/

This information is subject to change as more up-to-date data become available.

01/27/2022, M3.5 near Grapevine

Zackary Newman — Thu, 27 Jan 2022 15:04:47 +0000

Event

27 Jan 2022 02:51:22 PST, (35.045, -118.995), depth 12.0km.
13km NNW of Grapevine, California

Aftershocks

As of 27 Jan 2022, 06:58AM PST, there have been 4 aftershocks recorded.
The largest was M2.8 (smallest M1.3).
More aftershocks 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 108 events of M4 or greater within 10km of today’s event.
The largest historic event was M7.5 on 1952/07/21.
The most recent historic event was M4.2 on 22 Sep 2005.

Faults

CFM fault associations: most likely White Wolf fault (80%). Alternates: Not associated with a CFM modeled fault (19%), Other CFM faults (1%).*
Nearby faults: Wheeler Ridge fault zone (Wheeler Ridge fault) (1.7 km), unnamed faults (1952 earthquake fractures) (3.9 km), Pleito fault zone, western Pleito section (Pleito fault) (6.3 km) and Pleito fault zone, eastern Pleito section (Pleito fault) (6.9 km).**

Additional Information

Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.
Visit scedc.caltech.edu to access any data recorded by the SCSN.

Below are the waveform data associated with this event, as recorded in our Live Seismograms Feed. Notice the M2.8 aftershock less than 1 minute following the mainshock.

CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth & Planetary Sciences.

Probability: The probability in percent the earthquake is associated with this fault.

SCSN: Caltech/USGS Southern California Seismic Network

This information is subject to change as more up-to-date data become available.

07/20/2020, M3.6 near Grapevine

Zackary Newman — Tue, 21 Jul 2020 14:50:03 +0000

Event

20 Jul 2020 15:01:53 PDT, (34.932, -119.038), depth 13.6km.
10km W of Grapevine, California

Aftershocks

As of 21 Jul 2020, 07:43AM PDT, there has been 1 aftershock recorded, M1.5.
Aftershocks 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 98 events of M4 or greater within 10km of today’s event.
The largest historic event was M7.5 on 1952/07/21.
The most recent historic event was M4.2 on 22 Sep 2005.

Faults

CFM fault associations: most likely Pleito fault (45%). Alternates: Not associated with a CFM modeled fault (42%), Other CFM faults (13%).*
Nearby faults: Pleito fault zone, eastern Pleito section (Pleito fault) (4.5 km), Pleito fault zone, western Pleito section (Pleito fault) (6.5 km), unnamed faults (1952 earthquake fractures) (7.8 km), San Andreas fault zone, Cholame-Carrizo section (9.8 km), Wheeler Ridge fault zone (Wheeler Ridge fault) (9.9 km), Pleito fault zone, western Pleito section (Oak Hill thrust) (10.7 km), Big Pine fault zone, Lockwood Valley section (Lockwood Valley fault) (12.5 km), Big Pine fault zone, Lockwood Valley section (12.5 km), Frazier Mountain thrust system (North Frazier Mountain thrust) (12.9 km), Frazier Mountain Thrust System (Cuddy Canyon fault) (14.5 km) and Big Pine fault zone, Lockwood Valley section (South Lockwood Valley fault) (14.6 km).**

Additional Information

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.

CFM Fault: SCEC CFM 5.0 Fault name and closest segment if available; The CFM is maintained by Harvard University, Dept of Earth & Planetary Sciences.

Probability: The probability in percent the earthquake is associated with this fault.

SCSN: Caltech/USGS Southern California Seismic Network

This information is subject to change as more up-to-date data become available.

04/16/2018, M3.8 near Grapevine

Zackary Newman — Mon, 16 Apr 2018 17:11:12 +0000

16 Apr 2018 09:36:48 PDT, (35.043, -119.042), depth 7.7km, 15km NW of Grapevine, 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. The following 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.

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%
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%) of an earthquake equal to or larger than this mainshock in the next 7 days.
WEAK AFTERSHOCKS (Magnitude 3 to 5): in addition, up to approximately 2 SMALL AFTERSHOCKS are expected in the same 7-DAY PERIOD and may be felt locally.

Historical seismicity: since our records began in 1932 we’ve had 103 events of M4 or greater within 10km of today’s event, the largest was M7.5 (1952/07/21) and the most recent was M4.2 on 22 Sep 2005. Known as the Kern County earthquake, the 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. Many of the other catalog events in this area are aftershocks of the 1952 Kern County earthquake. The M3.7 earthquake near Bodfish on April 13, 2018, was located approximately 60 km from this event near Grapevine, but is also along the section of fault responsible for the Kern County earthquake.
Nearby faults: Wheeler Ridge fault zone (Wheeler Ridge fault) (1.5 km), Pleito fault zone, western Pleito section (Pleito fault) (3.8 km), unnamed faults (1952 earthquake fractures) (4.2 km), Pleito fault zone, eastern Pleito section (Pleito fault) (5.9 km) and Pleito fault zone, western Pleito section (Oak Hill thrust) (13.5 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.