Tsunami
Large earthquakes under the sea floor will sometimes cause a tsunami (soo-nah-me), a series of waves varying in size and frequency. The waves are full of debris and can rise to over 30 feet high. You cannot surf a tsunami.
If the ground shakes for more than 20 seconds or the water recedes dramatically, move to higher ground immediately. Stay off the beach and away from large bodies of water until local authorities have told you that it is safe to return.
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