Here's a map of the significant fault lines and strong earthquakes in the Bay Area. 24/7 Live San Francisco East Bay South Bay Peninsula North Bay Welcome, Mickey ...

The map shows the major seismic faults in the San Francisco Bay Area (colored lines) and the epicenters of the recorded earthquakes of magnitude 5 or greater that have occurred since 1900 ...

Inquiries about the earthquake fault zone maps can be sent to [email protected]. Caption: File: Homes stack up on a hillside in San Francisco on Wednesday, Feb. 9, 2004. (AP Photo/Marcio ...

SAN FRANCISCO (CBS SF) -- California is covered with a spiderweb network of fault lines, many of them relatively unknown, like the spur of the Calaveras Fault where Monday night's 4.5 earthquake ...

The largest earthquakes recorded on the San Andreas fault include the 1906 San Francisco earthquake (approximately magnitude 7.8) and the 1989 Loma Prieta earthquake (magnitude 6.9).

Four fault zone maps were released on Thursday along with 10 seismic hazard zones. One of the fault zones was in the Napa area where the 2014 earthquake occurred.

But San Pablo Bay—the northern section of the greater San Francisco Bay that conceals this fault line—is heavily layered with mud containing tiny pockets of gas.