SCSNTrabuco Canyon – SCSN https://www.scsn.org/index.html Southern California Seismic Network Wed, 30 Apr 2025 14:59:53 +0000 en-US hourly 1 https://wordpress.org/?v=5.1.12 02/06/2022, M3.6 near Trabuco Canyon ../../../../index.php/2022/02/07/02-06-2022-m3-6-near-trabuco-canyon/index.html ../../../../index.php/2022/02/07/02-06-2022-m3-6-near-trabuco-canyon/#respond Mon, 07 Feb 2022 18:53:14 +0000 http://www.scsn.org/?p=4275 …
Read more ›
]]> Event

  • 06 Feb 2022 15:24:47 PST, (33.732, -117.478), depth 11.0km.
  • 13km NE of Trabuco Canyon, California

Aftershocks

  • As of 07 Feb 2022, 10:44AM PST, there have been 2 aftershocks recorded.
  • The largest was M1.3 (smallest M0.6).
  • 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 8 events of M4 or greater within 10km of today’s event.
  • The largest historic event was M5.2 on 1938/05/31.
  • The most recent historic event was M4.7 on 02 Sep 2007.

Faults

  • CFM fault associations: most likely Glen Ivy South fault (53%). Alternates: Not associated with a CFM modeled fault (3%), Other CFM faults (44%).*
  • Nearby faults: Elsinore fault zone, Glen Ivy section (Glen Ivy South fault) (0.9 km), Elsinore fault zone, Temecula section (Willard fault) (1.2 km), Elsinore fault zone, Glen Ivy section (Glen Ivy North fault) (1.2 km), Elsinore fault zone, Glen Ivy section (Eagle fault) (7.1 km), Elsinore fault zone, Temecula section (Wildomar fault) (11.4 km) and Elsinore fault zone, Glen Ivy section (Main Street fault) (12.4 km).**

Additional Information


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.

]]> ../../../../index.php/2022/02/07/02-06-2022-m3-6-near-trabuco-canyon/feed/ 0 01/25/2018, M4.0 near Trabuco Canyon ../../../../index.php/2018/01/25/01-25-2018-m4-0-near-trabuco-canyon/index.html ../../../../index.php/2018/01/25/01-25-2018-m4-0-near-trabuco-canyon/#respond Thu, 25 Jan 2018 14:54:35 +0000 http://www.scsn.org/?p=2560 …
Read more ›
]]>
  • 25 Jan 2018 02:09:56 PST, (33.742, -117.492), depth 11.2km, 12km NE of Trabuco Canyon, California
  • Aftershocks: so far (29 Jan 2018, 08:12AM PST) there have been 27 aftershocks recorded, the largest M3.1 (smallest M0.3). 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 was 1 event during the 3 days prior to the earthquake (within a 10 km radius), with M1.2 (2018/01/22).
    • Plot of seismicity through time, from 3 days before the M4.0 Trabuco Canyon event to approximately 3.5 days after. Top plot shows cumulative earthquake count against time. Bottom plot shows earthquake magnitude against time, the M4.0 event and M3.1 aftershock are plotted as red stars.

  • Historical seismicity: since our records began in 1932 we’ve had 7 events of M4 or greater within 10km of today’s event, the largest was M5.2 (1938/05/31) and the most recent was M4.7 on 02 Sep 2007.
    • Map showing the M4.0 earthquake near Trabuco Canyon (red star) with foreshocks and aftershocks in a 10km radius shown as circles colored by time (blue = early, red = late) and sized by magnitude. Grey stars labelled by magnitude show historic earthquakes. Grey lines show the mapped fault strands in the Elsinore fault zone.

  • Mechanism: the event has a thrust mechanism on a near east-west trending fault plane as shown by the moment tensor below.
    Moment tensor for the M4.0 event on 25 Jan 2018 near Trabuco Canyon.

    The nearest mapped faults to this event are in the Elsinore fault zone, most strands of which usually host strike-slip events. However, the Glen Ivy strands of the Elsinore fault show oblique as well as strike-slip mechanisms (as shown below), and in the region north of Lake Elsinore it is thought the fault may form a restraining bend at depth contributing to uplift of the Santa Ana mountains (Hull & Nicholson, 1992) and consistent with thrust mechanisms such as the 2018/01/25 earthquake.

    Figure from Hull & Nicholson (1992) showing focal mechanisms for selected earthquakes from the Elsinore-Temecula trough. The M4.0 event on 25 Jan 2018 near Trabuco Canyon has been added as a red star, and shows a consistent mechanism with earlier observed earthquakes.

  • Nearby faults: Elsinore fault zone, Glen Ivy section (Glen Ivy South fault) (0.9 km), Elsinore fault zone, Glen Ivy section (Glen Ivy North fault) (1.4 km), Elsinore fault zone, Temecula section (Willard fault) (2.0 km), Elsinore fault zone, Glen Ivy section (Eagle fault) (5.6 km), Elsinore fault zone, Glen Ivy section (Main Street fault) (10.7 km), Elsinore fault zone, Chino section (Chino fault) (12.8 km) and Elsinore fault zone, Temecula section (Wildomar fault) (13.1 km).
  • The ShakeMap (below) shows that ground shaking was strongest to the north and east of the earthquake hypocenter, consistent with stronger shaking being felt in basins and valleys (generally weaker geology, greater chance of amplification effects), and potentially also an effect of source mechanism.
    ShakeMap for the M4.0 event on 25 Jan 2018 near Trabuco Canyon.

  • 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.

  • References:
    Hull, A.G. & C. Nicholson, 1992. Seismotectonics of the Northern Elsinore Fault Zone, Southern California. Bull. Seismo. Soc. Am. 82 (2) pp. 800-818.
    • ]]>     ../../../../index.php/2018/01/25/01-25-2018-m4-0-near-trabuco-canyon/feed/ 0