Event
- 05 Jan 2024 10:55:54 PST, (34.258, -117.508), depth 9.2km.
- 1km W of Lytle Creek, California
Aftershocks
- As of 09 Jan 2024, 12:50PM PST, there have been 3 aftershocks recorded.
- The largest was M2.0 (smallest M0.8).
- 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 20 events of M4 or greater within 10km of today’s event.
- The largest historic event was M5.2 on 1970/09/12.
- The most recent historic event was M4.4 on 30 Dec 2015.
Faults
- CFM fault associations: most likely Glen Helen fault (24%). Alternates: Other CFM faults (76%).*
- Nearby faults: San Jacinto fault zone, San Bernardino section (North Fork Lytle Creek fault) (0.2 km), San Jacinto fault zone, San Bernardino section (Glen Helen fault) (0.8 km), San Jacinto fault zone, San Bernardino section (Middle Fork Lytle Creek fault) (0.9 km), San Jacinto fault zone, San Bernardino section (San Jacinto fault) (0.9 km), San Gabriel fault zone, San Gabriel River section (San Gabriel fault) (2.0 km), San Jacinto fault zone, San Bernardino section (South Fork Lytle Creek fault) (2.6 km), San Andreas fault zone, San Bernardino Mountains section (South Branch SAF) (2.9 km), San Jacinto fault zone, San Bernardino section (Lytle Creek fault) (3.2 km), San Andreas fault zone, Mojave section (3.6 km), San Andreas fault zone, San Bernardino Mountains section (5.5 km), Stoddard Canyon fault (5.8 km), Cleghorn fault zone, southern Cleghorn section (Cleghorn fault) (5.8 km), Icehouse Canyon fault zone (Icehouse Canyon fault) (6.9 km), San Antonio fault (7.5 km), San Andreas fault zone, San Bernardino Mountains section (Peter’s fault) (8.4 km), San Gabriel fault zone, San Gabriel River section (Weber fault) (8.8 km), Sierra Madre fault zone, Cucamonga section (Cucamonga fault) (9.8 km), San Andreas fault zone, San Bernardino Mountains section (Tokay Hill fault) (10.2 km), Red Hill-Etiwanda Avenue fault (Etiwanda Avenue fault) (10.9 km), Waterman Canyon fault zone (Waterman Canyon fault) (13.4 km), Red Hill-Etiwanda Avenue fault (13.7 km) and Cleghorn fault zone, northern Cleghorn section (West Silverwood Lake fault) (15.0 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.
