SCSNJulian – SCSN

04/14/2025, M5.2 near Julian

Zackary Newman — Mon, 14 Apr 2025 17:21:15 +0000

Event

14 Apr 2025 10:08:28 PDT, (33.043, -116.595), depth 13.4km.
4km S of Julian, California

Aftershocks

As of 14 Apr 2025, 10:16AM PDT, there have been 8 aftershocks recorded.
The largest was M3.0 (smallest M2.0).
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 13 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M3.3 (2025/04/13).

Historical Seismicity

Since our records began in 1932 we’ve had 6 events of M4 or greater within 10km of today’s event.
The largest historic event was M4.5 on 1984/10/10.
The most recent historic event was M4.3 on 04 Dec 1991.

Faults

CFM fault associations: most likely Elsinore fault; south segment (76%). Alternates: Not associated with a CFM modeled fault (23%), Other CFM faults (1%).*
Nearby faults: Elsinore fault zone, Julian section (Elsinore fault) (4.7 km), Elsinore fault zone, Julian section (Earthquake Valley fault) (11.0 km) and Elsinore fault zone, Earthquake Valley fault, Julian section (11.9 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.

*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.

05/09/2022, M3.5 near Julian

Zackary Newman — Tue, 10 May 2022 13:40:52 +0000

Event

09 May 2022 14:35:33 PDT, (33.040, -116.353), depth 11.3km.
24km E of Julian, California

Aftershocks

As of 10 May 2022, 06:36AM PDT, there have been 17 aftershocks recorded.
The largest was M2.6 (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 6 events during the 3 days prior to the earthquake (within a 10 km radius).
The largest was M1.5 (2022/05/09).

Historical Seismicity

Since our records began in 1932 we’ve had 31 events of M4 or greater within 10km of today’s event.
The largest historic event was M5.0 on 1940/06/04.
The most recent historic event was M4.0 on 22 Dec 2012.

Faults

CFM fault associations: most likely Earthquake Valley fault; main segment (45%). Alternates: Not associated with a CFM modeled fault (3%), Other CFM faults (52%).*
Nearby faults: Elsinore fault zone, Julian section (Elsinore fault) (7.9 km), Elsinore fault zone, Julian section (Earthquake Valley fault) (10.0 km), Elsinore fault zone, Coyote Mountain section (Elsinore fault) (10.2 km) and Elsinore fault zone, Earthquake Valley fault, Julian section (12.0 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.

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.

12/06/2017, M4.0 near Julian

Jennifer Andrews — Thu, 07 Dec 2017 02:27:48 +0000

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.

12/02/2015, M3.3 near Julian

Jennifer Andrews — Thu, 03 Dec 2015 00:24:42 +0000

02 Dec 2015 15:27:36 PST, (33.027, -116.433), depth 6.9km, 17km ESE of Julian, California
Aftershocks: so far there have been 4 aftershocks recorded, the largest 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.
Historical seismicity: since our records began in 1932 we’ve had 5 events of M4 or greater within 10km of today’s event, the largest was M4.7 (1957/01/24) and the most recent was M4.2 on 13 Mar 2010.
Nearby faults: Elsinore fault zone, Julian section (Elsinore fault) (2.4 km).
Links for: USGS earthquake page, ShakeMap, DYFI.