SCSNBanning – SCSN

04/25/2023, M3.6 near Banning

Zackary Newman — Sat, 29 Apr 2023 14:43:18 +0000

Event

25 Apr 2023 23:46:58 PDT, (34.028, -116.845), depth 19.7km.
12km NNE of Banning, California

Aftershocks

As of 29 Apr 2023, 07:33AM PDT, there have been 12 aftershocks recorded.
The largest was M1.4 (smallest M0.5).
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 3 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M1.3 (2023/04/23).

Historical Seismicity

Since our records began in 1932 we’ve had 54 events of M4 or greater within 10km of today’s event.
The largest historic event was M6.3 on 1992/06/28.
The most recent historic event was M4.5 on 08 May 2018.

Faults

CFM fault associations: most likely Beaumont A blind fault (47%). Alternates: Not associated with a CFM modeled fault (5%), Other CFM faults (48%).*
Nearby faults: San Andreas fault zone, San Bernardino Mountains section (Mission Creek fault) (1.4 km), San Andreas fault zone, San Bernardino Mountains section (South Branch SAF) (2.5 km), San Andreas fault zone, San Bernardino Mountains section (3.2 km), San Andreas fault zone, San Bernardino Mountains section (Mill Creek fault) (4.8 km), San Andreas fault zone, San Bernardino Mountains section (Gandy Ranch fault) (5.5 km), San Andreas fault zone, San Bernardino Mountains section (Banning fault) (7.2 km), San Andreas fault zone, San Bernardino Mountains section (Banning fault B) (7.6 km), San Gorgonio Mountain fault (8.5 km), San Gorgonio Pass fault zone (San Gorgonio Pass fault) (8.7 km), San Andreas fault zone, San Bernardino Mountains section (Banning fault A) (10.1 km), Pinto Mountain fault zone (Pinto Mountain fault) (11.8 km), San Gorgonio Pass fault zone (Cherry Valley fault) (14.4 km), Beaumont Plain fault zone (14.6 km) and Santa Ana fault zone (Santa Ana fault) (14.7 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.

06/25/2017, M3.5 near Banning

Zackary Newman — Mon, 26 Jun 2017 15:38:05 +0000

25 Jun 2017 06:53:24 PDT, (34.002, -116.903), depth 13.9km, 9km NNW of Banning, California
Aftershocks: so far (26 Jun 2017, 08:23AM PDT) there has been 1 aftershock recorded, M1.1. 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 2 events during the 3 days prior to the earthquake (within a 15 km radius), the largest was M1.6 (2017/06/25).
Historical seismicity: since our records began in 1932 we’ve had 19 events of M4 or greater within 10km of today’s event, the largest was M5.0 (1965/10/17) and the most recent was M4.4 on 06 Jan 2016.
Nearby faults: San Andreas fault zone: San Bernardino Mountains section (Gandy Ranch fault) (0.6 km), San Bernardino Mountains section (South Branch SAF) (2.3 km), San Bernardino Mountains section (Mission Creek fault) (3.2 km), San Bernardino Mountains section (Banning fault) (3.5 km), San Bernardino Mountains section (4.9 km), San Bernardino Mountains section (Banning fault B) (7.5 km), San Bernardino Mountains section (Mill Creek fault) (8.7 km); San Gorgonio Pass fault zone (San Gorgonio Pass fault) (5.2 km), San Gorgonio Pass fault zone (Cherry Valley fault) (8.4 km); Beaumont Plain fault zone (8.5 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.The closest associated stations are CI.DGR 40km away
and CI.RVR 43km away

01/06/2016, M4.4 near Banning

Zackary Newman — Wed, 06 Jan 2016 15:55:00 +0000

06 Jan 2016 06:42:34 PST, (33.958, -116.888), depth 16.7km, 4km NNW of Banning, California
Aftershocks: so far (06 Jan 2016, 9:10am PST) there has been 1 aftershock recorded, M1.0. 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 M4.9 (1946/09/28) and the most recent was M4.3 on 12 Jan 2010.
Nearby faults: San Andreas fault zone, San Bernardino Mountains section (Banning fault) (0.7 km), San Gorgonio Pass fault zone (San Gorgonio Pass fault) (2.1 km), San Andreas fault zone, San Bernardino Mountains section (Gandy Ranch fault) (2.7 km), San Andreas fault zone, San Bernardino Mountains section (Banning fault B) (4.7 km), San Andreas fault zone, San Bernardino Mountains section (South Branch SAF) (4.7 km), San Andreas fault zone, San Bernardino Mountains section (5.0 km), Beaumont Plain fault zone (8.2 km), San Jacinto fault zone, San Jacinto Valley section (11.5 km) and San Jacinto fault zone, San Jacinto Valley section (Claremont fault) (16.2 km).
Links for: USGS earthquake page, ShakeMap, DYFI.
Visit our special reports page for further information on local notable earthquakes.

The M4.4 earthquake on 6 Jan 2016 was located in the middle of this cross section at 16 km depth (shown as a white star with red edges). The tectonics in this region are complex with many intersecting faults. Cross section courtesy of Craig Nicholson, UCSB