ShakeMap is a product of the U.S. Geological Survey Earthquake Hazards Program in conjunction with regional seismic network operators. ShakeMap sites provide near-real-time maps of ground motion and shaking intensity following significant earthquakes. These maps are used by federal, state, and local organizations, both public and private, for post-earthquake response and recovery, public and scientific information, as well as for preparedness exercises and disaster planning.
Southern California ShakeMap is here.
A full list of the ShakeMaps is below:
btw, the times in the ShakeMaps are given in UTC or "coordinated universal time". At the link below, you can toggle back and forth between UTC and Pacific Time.
Pacific Time in UTC is here.
Pacific Time in "Pacific Time" is here.