A 3.5-magnitude earthquake near Concord in the East Bay shook the area on Sunday, two days after a quake of similar magnitude ...

By contrast, an earthquake on the Puente Hills thrust fault system probably would max out at a magnitude 7.5 — still powerful ...

The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. It forms the tectonic boundary between the Pacific Plate and the North ...

This sudden jerk creates an earthquake. The San Andreas Fault is undoubtedly the most famous transform boundary in the world. To the west of the fault is the Pacific plate, which is moving northwest.

Recent earthquakes that have shaken California may be a result of a Southern California fault line considered even more dangerous than the San Andreas ... geological fault system located in ...

That two inches -- the average distance the San Andreas fault moves each year -- has the ... argues that they should be treated as a single system with potential for earthquake ruptures generating ...