Earthquake Hazards in California

The two most hazardous faults in the region are the Hayward-Rodgers Creek fault system and the San Andreas fault.The East Bay has a higher earthquake hazard than the San Francisco peninsula due to the higher number of faults that traverse the East Bay.

http://earthquake.usgs.gov/regional/nca/virtualtour/modern.php

Siesmic Waves!

Seismic waves are divided into two types.. Body waves and surface waves. Body waves include P and S waves, and these are the two types of waves that are used to determine the internal structure of the Earth.