Did You feel it? Report it :
Report your experience of an earthquake (enter your ZIP code and answer questions such as "Did the earth quake wake you up? - Did objects fall off shelves? etc." ) , on the following web site:
http://www.earthquake.usgs.gov/eqcenter/dvfi.php
Shake maps are made from the "Did You Feel It" input. The Southern California Shake Map, can be found at:
http://www.cisn.org/shakemap
Resources for the sections below, and online versions of the Southern California and San Francisco Bay Region can be found at:
http://www.earthquakecountry.info