The rare bulletin at 10:49 a.m. from NOAA, the National Oceanic and Atmospheric Administration, came after a 7.0 earthquake off the Humboldt County coast. It caused police to scramble and local officials to set off tsunami warning sirens along the coast and around San Francisco Bay. Berkeley ordered evacuations along its waterfront. BART stopped trains. Anxiety levels jumped. Then an hour later, it was cancelled.
They were being cautious, said Amy Williamson, a research scientist at the UC Berkeley Seismology Lab. They would rather have a warning and retract it an hour later than to have no warning at all and have people near the coast line suffer the consequences. A tsunami is a large wave caused by a sudden displacement in the ocean.
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