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So how can Southern Californians tell a normal quake apart from one likely to cause a tsunami? If the hard shaking lasts for an extended period of time, residents in a tsunami zone should escape to higher ground without waiting for a tsunami warning, said Bohlen.

"We are talking about (a quake) that takes 20,30,40 seconds or longer, or if you see water suddenly recede — those are both signs that you should head to higher ground immediately because it has the potential for there to be a tsunami wave headed your way," Bohlen said. "That is going to be a near-shore event, and you aren't going to have any time to get any sort of warning. The water moves out so quickly that fish are stranding on the sand."

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