File-In this Tuesday Aug.23,2011 file photo office workers gather on the sidewalk in downtown Washington, moments after a 5.9 magnitude erthquake. The East Coast earthquake left more than just ... more 
File-In this Tuesday Aug.23,2011 file photo office workers gather on the sidewalk in downtown Washington, moments after a 5.9 magnitude erthquake. The East Coast earthquake left more than just residents unaccustomed to feeling the ground shake and sway in a daze. It also surprised scientists who spend their careers trying to untangle the mysteries of sudden ground shifts. (AP Photo/J. Scott Applewhite,File) less 
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Associated Press | Photo By J. Scott Applewhite,File
Sun, Sep 4, 2011 5:32 PM EDT