California has been rocked by at least nine earthquakes since Thursday, raising fears that the "Big One" could be near.

A preliminary 2.7 magnitude earthquake struck near Santa Rosa, according to the United States Geological Survey.

It starts with better building policies that recognize future risks, but there are many other important steps.

This is a concern that some cities along the San Francisco Bay are sinking at an alarming rate, according to a new NASA-led study, examining the shorelines.

Slow-moving slides are common around the world, and especially in California, where several hundred have been mapped in ...