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2011.03.11 - M9.0 Tohoku Earthquake

The magnitude 9.0 Tohoku earthquake on March 11, 2011, which occurred near the northeast coast of Honshu, Japan, resulted from thrust faulting on or near the subduction zone plate boundary between the Pacific and North America plates. At the latitude of this earthquake, the Pacific plate moves approximately westwards with respect to the North America plate at a rate of 83 mm/yr, and begins its westward descent beneath Japan at the Japan Trench.

2011.02.21 - M6.3 Aftershock of the Darfield, NZ Earthquake

The February 21, 2011 South Island, New Zealand earthquake occurred as part of the aftershock sequence of the M 7.0 September 3, 2010 Darfield, NZ earthquake. The February 21st earthquake involved oblique-thrust faulting at the easternmost limit of previous aftershocks, and like the mainshock itself is broadly associated with regional plate boundary deformation as the Pacific and Australia plates interact in the central South Island, New Zealand.

2010.10.21 - ShakeOut Table-Top Exercise

Join the 2010 ShakeOut Day for a "table-top exercise" (TTX) to improve scientific coordination for earthquake response. The goal of the TTX is to increase the chance of obtaining crucial data to help resolve important questions in earthquake science. We plan to review how field scientific reconnaissance information will flow, the "essential elements of information" required by emergency management, and how that information will be distilled and passed along as appropriate through our system. The idea is that our scientific coordination TTX will be complementary to the emergency preparedness and other public outreach activities, planned and exercised by others on ShakeOut day this year. Join in discussions on this page.

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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