Tsunamis are NOT like normal waves at the beach. When they approach land they are like a surge or fast flood. Earthquakes are nature’s warning for a possible tsunami, so if you are by the coast and the earth moves, first: drop, cover, and hold on; second: when the shaking stops, get to high ground; and third: stay away from the coast.
Sometimes it takes many hours for the first waves of a tsunami to reach the shoreline, and often times the first waves (or surges) are not the highest or most powerful. Whether we are under a tsunami advisory, watch, or warning it is imperative that anyone in coastal areas listen to DEM’s instructions. Our primary methods of issuing the notification are AlertSF and
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