San Francisco Earthquake
Today San Francisco suffered a 4.2 magnitude earthquake. The epicenter was a couple of miles north-east of the center of Oakland. The earthquake occurred at 4:42 a.m. and caused a power outage to 5,000 homes in the area.
Thankfully the earthquake was not as serious as the quake that hit Japan this week.
There are a number of earthquake KML files available from the USGS Earthquakes Hazards program.
For example, this KML shows earthquakes that have occurred in the last seven days on Google Earth.
And this one shows the Bay Area Faults
The USGC also has a number of layers about the tragic 1906 earthquake in San Francisco.
Origin Time and Epicenter of the 1906 Quake
Historic Photographs of the 1906 Earthquake