In its history, San Fransisco already experience greater earthquake before. The San Francisco earthquake of 1906 was a major earthquake that struck San Francisco, California, and the coast of Northern California. It struck at 5:12 a.m on Wednesday, April 18, 1906. The most widely accepted estimate for the magnitude of the earthquake is a moment magnitude (Mw) of 7.9. However, other values have been proposed, from 7.7 to as high as 8.25.
Over the long run, earthquakes and shifting fault lines remake the planet. The slip-sliding motion of the San Andreas fault causes San Francisco to move toward Los Angeles at the rate of about 2 inches a year.
