Central Virginia Seismic Zone
New Earthquake Session at the Seismological Society of America
Eastern Section Meeting, October 16‐18, 2011
AEG members who practice in the Virginia region and Eastern Seaboard will be interested in a special seismology session that has been added to the annual meeting of the Eastern Section of the Seismological Society of America.
The abstract submission deadline for the SSA Eastern Section Meeting has been extended to September 16 to allow participants to plan presentations for the newly formed special session on last month’s Virginia earthquake (see session description below).
The Eastern Section Annual Meeting of the Seismological Society of America will be held 1618 October 2011 in Little Rock, Arkansas. Discounted Early Bird Registration is available through September 19. Online registration at the regular rate continues through October 7. Onsite registration is also available. The new session description is below:
The Mw5.8 Central Virginia Seismic Zone Earthquake of August 23, 2011
On 2011 August 23 at 17:51:04 UTC a large earthquake (Mw5.8) struck in the Central Virginia seismic zone and was felt from Maine to Georgia along the Eastern Seaboard and west to Chicago and western Tennessee. Significant damage was reported in Washington D.C. ( 135 km away) and minor damage in Baltimore (200 km).
The USGS tallied about 142,000 felt reports submitted to the DYFI internet community intensity system, making it the most widely felt earthquake since the web‐site began, and strongly indicating that more people felt this quake than any other in U.S. history.
In the weeks following the main shock, numerous aftershocks occurred with one as large as M4.5 and several in the M3 to M2 range. Since 1774, the Virginia seismic zone has produced many small earthquakes and suffered damage from several infrequent larger earthquakes. The largest damaging earthquake (magnitude 4.8) in the seismic zone occurred in 1875.
In the days following the main shock forty‐five portable seismic stations were deployed by several organizations making this one of the best‐recorded aftershock sequences in the eastern U.S. The Seismological Society of America solicits scientific contributions from all aspects of earthquake studies on the recent large earthquake in the Virginia seismic zone including: strong ground motion, aftershock production, earthquake re‐location, attenuation, site amplification, building damage, ground failure, and paleo‐seismology. AEG members are welcome to present papers on seismically induced landslides, liquefaction, permanent ground deformation, and seismic safety planning.
The SSA Conveners are: Daniel McNamara, Steve Horton and Rob Williams. For further information go to the main website of the Seismological Society of America: http://www.seismosoc.org
The abstracts of these papers will be published in future issues of Seismological Research Letters and the Bulletin of the Seismological Society of America. AEG members should check these journals of our sister societies for further updates in the months ahead. There will also be special sessions on the Central Virginia Seismic Zone at the annual Fall Meeting of the American Geophysical Union in San Francisco, December 5‐9, 2011.
EERI Clearinghouse The Earthquake Engineering Research Institute has established a clearinghouse at this address: http://www.eqclearinghouse.org/2011‐08‐23‐virginia/ EERI will also publish papers on this earthquake in its journal, Earthquake Spectra, and there will be a timely summary report in its “Learning from Earthquakes” Series that is financed by the National Science Foundation.
Reported 2 Sept 2011 by Robert H. Sydnor, LMAEG, LMSSA, LMAGU, MEERI