SCSNLudlow – SCSN

11/17/2020, M3.5 near Ludlow

Zackary Newman — Tue, 17 Nov 2020 17:55:25 +0000

Event

17 Nov 2020 09:32:32 PST, (34.860, -116.338), depth 4.4km.
22km NW of Ludlow, California

Aftershocks

As of 17 Nov 2020, 09:48AM PST, there have been no aftershocks recorded.
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 45 events of M4 or greater within 10km of today’s event.
The largest historic event was M5.1 on 1965/09/25.
The most recent historic event was M4.0 on 30 Mar 2015.

Faults

CFM fault associations: most likely Cady fault (64%). Alternates: Not associated with a CFM modeled fault (30%), Other CFM faults (6%).*
Nearby faults: Cady fault (4.4 km), Lavic Lake fault zone (9.3 km), Unnamed fault east of Pisgah (11.2 km), Ludlow fault (11.7 km) and Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (14.2 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.

*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.

02/07/2019, M4.0 near Ludlow

Jennifer Andrews — Thu, 07 Feb 2019 22:36:44 +0000

07 Feb 2019 08:41:24 PDT, (34.703, -116.287), depth 1.6km, 12km W of Ludlow, California
Aftershocks: so far (17 May 2019, 08:43AM PDT) there have been 81 aftershocks recorded, the largest M4.0 (smallest M0.4). 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 13 events during the 3 days prior to the earthquake (within a 10 km radius), the largest was M3.2 (2019/02/07).
Historical seismicity: since our records began in 1932 we’ve had 62 events of M4 or greater within 10km of today’s event, the largest was M7.1 (1999/10/16) and the most recent was M4.1 on 23 Feb 2016.
CFM fault associations: most likely Hector Mine rupture dipping (91.6%). Alternates: Not associated with a CFM modeled fault (7.9%), Other CFM faults (0.5%).*
Nearby faults: Unnamed fault east of Pisgah (5.1 km), Lavic Lake fault zone (Lavic Lake fault) (5.8 km), Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (9.8 km), Lavic Lake fault zone (10.5 km), Ludlow fault (11.1 km) and Pisgah-Bullion fault zone, Bullion section (Bullion fault) (12.9 km).**
Links for: USGS earthquake page, ShakeMap, DYFI, waveforms.
Visit our special reports page for further information on local notable earthquakes.

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.

01/14/2018, M3.7 near Ludlow

Jennifer Andrews — Sun, 14 Jan 2018 20:06:49 +0000

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.

02/22/2016, M4.1 near Ludlow

Jennifer Andrews — Tue, 23 Feb 2016 03:46:26 +0000

22 Feb 2016 19:19:52 PST, (34.695, -116.243), depth 1.4km, 8km WSW of Ludlow, California
Aftershocks: so far (23 Feb 2016, 07:47AM PST) there have been 4 aftershocks recorded, the largest M2.9. 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 1 km radius), the largest was M3.5 (2016/02/23).
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 was M5.8 (1999/10/16) and the most recent was M4.1 on 24 Jan 2016.
Nearby faults: Ludlow fault (7.7 km), Unnamed fault east of Pisgah (8.6 km), Lavic Lake fault zone (9.7 km), Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (13.1 km), Pisgah-Bullion fault zone, Bullion section (Bullion fault) (15.0 km) and Bullion Mountains fault zone (15.0 km).
Links for: USGS earthquake page, ShakeMap, DYFI.
Visit our special reports page for further information on local notable earthquakes.

01/24/2016, M4.1 near Ludlow

Zackary Newman — Sun, 24 Jan 2016 15:56:37 +0000

24 Jan 2016 07:32:16 PST, (34.697, -116.238), depth 2.0km, 8km WSW of Ludlow, California
Aftershocks: so far (24 Jan 2016, 07:53AM PST) there has been 1 aftershock recorded, M2.2. 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 1 km radius), the largest was M2.8 (2016/01/24).
Historical seismicity: since our records began in 1932 we’ve had 18 events of M4 or greater within 10km of today’s event, the largest was M5.8 (1999/10/16) and the most recent was M4.3 on 06 Oct 2013.
Nearby faults: Ludlow fault (7.2 km), Unnamed fault east of Pisgah (8.9 km), Lavic Lake fault zone (10.0 km), Lavic Lake fault zone (Lavic Lake fault) (10.2 km) and Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (13.6 km).
Links for: USGS earthquake page, ShakeMap, DYFI.
Visit our special reports page for further information on local notable earthquakes.

01/19/2016, M3.6 near Ludlow

Jennifer Andrews — Tue, 19 Jan 2016 16:24:17 +0000

19 Jan 2016 02:21:06 PST, (34.692, -116.237), depth 2.4km, 8km WSW of Ludlow, California.
Aftershocks: so far (19 Jan 2016, 08:07AM PST) there have been 7 aftershocks recorded, the largest M3.0. 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 5 events during the 3 days prior to the earthquake (within a 1 km radius), the largest was M2.9 (2016/01/19).
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 M5.8 (1999/10/16) and the most recent was M4.3 on 06 Oct 2013.
Nearby faults: Ludlow fault (7.1 km), Lavic Lake fault zone (9.6 km), Pisgah-Bullion fault zone, Pisgah section (Pisgah fault) (13.6 km) and Bullion Mountains fault zone (14.7 km).
Links for: USGS earthquake page, ShakeMap, DYFI.
Visit our special reports page for further information on local notable earthquakes.