We all know that the risks we face depend not just on who we are but where we are. California is the most earthquake-prone state in the continental United States but, even within California, the hazard is far from uniform. San Diego is at scant danger compared with the San Francisco Bay area, for example. And within the Bay area itself, your fate during an earthquake depends on the type of structure you're in and whether tectonic convulsions can liquify the ground beneath you.

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