"The most widely accepted magnitude for the earthquake is a moment magnitude (Mw) 7.8 however other values have been proposed [1]. The mainshock epicenter occurred offshore about 2 miles from the city. It ruptured along the San Andreas Fault both northward and southward for a total length of 296 miles (477 kilometers)[2]. Shaking was felt from Oregon to Los Angeles, and inland as far as central Nevada. The earthquake and resulting fire would be remembered as one of the worst natural disasters to hit a major city in the history of the United States, comparable in devastation to the Galveston Hurricane of 1900 and Hurricane Katrina."
There are numerous sites that gather comprehensive information on this event.
NPR: One Hundred Years After the San Francisco Quake
Library of Congress. American Memory: Before and After the Great Earthquake and Fire, Early Films of San Francisco
USGS: The 1906 San Francisco Quake
Ernster, the Virtual Library Cat
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