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2010.06.14 - M5.7 Aftershock of the El Mayor-Cucapah Earthquake

At  21:26 hrs PDT this evening, June 14, 2010, a Mw 5.7 earthquake occurred  5 miles southeast of the Imperial County community of Ocotillo.  The earthquake was the largest aftershock so far of the Mw 7.2 El Mayor-Cucapah earthquake that occurred on Easter Sunday. This earthquake occurred at the northern end of the aftershock zone in an area where there has been considerable activity during the past 10 weeks.  The Mw 5.7 earthquake rapidly was followed by a tight cluster of over 30 smaller earthquakes, about 20 of which were in the range of Mw 3.0 to 4.5.

2010.04.04 - El Mayor - Cucapah Earthquake

The magnitude 7.2 El Mayor - Cucapah earthquake of Sunday April 4th 2010, occurred in northern Baja California, approximately 40 miles south of the Mexico-USA border at shallow depth along the principal plate boundary between the North American and Pacific plates. This is an area with a high level of historical seismicity, and also it has recently been seismically active, though this is the largest event to strike in this area since 1892. The 4 April earthquake appears to have been larger than the M 6.9 earthquake in 1940 or any of the early 20th century events (e.g., 1915 and 1934) in this region of northern Baja California. See full summary by USGS.

From Greg Beroza:

As of 8:15pm PDT on Monday, April 5th, 2010, the earthquake has been christened the Sierra El Mayor earthquake. SCEC geologists and geodesists are in the field now, to be followed tomorrow (Tuesday, April 6th) by seismologists. Surface rupture appears to extend across Highway 2, south of the border.  Ken Hudnut is coordinating an airborne reconnaisance of surface rupture tomorrow that will provide important constraints on the distribution of faulting.

2010.07.07 - M5.4 Southern California

Coordinate and share information here ...

The 7th July 2010, M5.4 Borrego Earthquake Located near the Coyote Creek Segment of the San Jacinto Fault
Egill Hauksson, Nancy King, Lucy Jones, Sinan Akciz, Bob Dollar, Ken Hudnut, Kate Hutton

A M5.4 earthquake occurred in southern California at 4:53 pm (Pacific Time) about 30 miles south of Palm Springs, 25 miles southwest of Indio, and 13 miles north-northwest of Borrego Springs.  The earthquake occurred near the Coyote Creek segment of the San Jacinto fault, which is one of the strands of the San Jacinto fault. The earthquake exhibited sideways horizontal motion to the northwest, consistent with slip on the San Jacinto fault.  It was followed by more than 60 aftershocks of M>1.3 during the first hour.  Seismologists expect continued aftershock activity.

2009.10.15-Great California ShakeOut

As part of the 2009 ShakeOut, SCEC is conducting an earthquake response exercise, which will be coordinated with the USGS table-top exercises. The SCEC Earthquake Response Content Management System (ERCMS) will be activated and tested for post-earthquake response planning and coordination. Contact us if there are issues related to the SCEC ERCMS.

At this page, you can join in SCEC earthquake response activities for the 2009 ShakeOut. Greg Beroza and some of the SCEC group leaders are coordinating the science planning and activities, and we use the SCEC ERCMS to coordinate response plans with USGS and other partners.

For general science planning and coordination, join the discussion forums.

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