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2018.03.15 - Ides of March Post Earthquake Response Exercise

This is only a drill. The USGS will be using this site for an earthquake response exercise, scheduled for March 15, 2018. The M7.2 Scenario Earthquake - Sierra Madre will be used for this exercise.

Table Top Exercise (10:00am - 12:00pm)

2016.05.11 - Joint USGS-CGS Post-Earthquake Response Exercise, M7 Hayward Fault Scenario

This is only a drill. This scenario exercise was developed by USGS and CGS, and will begin at 9:00 am PT on May 11, 2016.

2014.08.24 - M6.0 South Napa Earthquake, California

USGS Press Release 8/26/2014 7:52pm PDT:

The area surrounding the epicenter of the mainshock is continuing to experience a number of aftershocks. As of Tuesday Aug. 26, 4 PM PDT, there have been more than 80 aftershocks; only four of these have had magnitudes greater than 3. The greater-than-magnitude 3 aftershocks include:

2013 Golden Guardian Exercise is "on" - please participate!


California Post-Earthquake Clearinghouse Exercise has started - please go to this web site to participate remotely.


The exercise will be centered on a major Bay Area earthquake scenario this year. Most exercise activity will take place this Wed., 5/15. For details, click on the first comment below and the attached PDF file. Thanks!

2012.08.26 - Swarm near Brawley, California

The swarm began last evening with six events of M<2.0, and activity picked up at 8:30 am today with three M2.5 events in a few minutes. As of 4:00 pm, CISN recorded more than 210 events. The largest two are M5.3 at 12:31 pm and M5.5 at 1:57 pm, and 38 events over M 3.0 have occurred.

2012.05.30-Golden Guardian Exercise

 The managing organizations of the California Earthquake Clearinghouse have organized an exercise, as part of Golden Guardian 2012, to test various field data collection tools for use in post-earthquake reconnaissance.

2011.10.23 - M7.2 Eastern Turkey

At least 534 people killed, 2,300 injured and 14,618 buildings and homes destroyed or damaged in the Ercis-Tabanli-Van area. Telecommunications, electricity and water services disrupted. Felt throughout eastern Turkey, Armenia, Georgia, Azerbaijan and northwestern Iran and parts of Iraq, Syria, Lebanon, Jordan and Israel.

2011.10.21 - Day-Afer-ShakeOut Table-Top Exercise

Join the 2011 Day-After-ShakeOut 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.

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.

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