Emergency management authorities identify key natural warning signs that indicate an imminent tsunami threat: 1) A noticeable, rapid receding or swelling of coastal ocean water exposing the seafloor; 2) A loud, continuous roaring sound resembling a low-flying jet engine or freight train coming from the ocean; 3) Strong, unusual sea currents or sudden swirling whirlpools in coastal harbors; 4) A severe earthquake felt strongly near the coast making it difficult to stand; and 5) Official emergency alerts or sirens broadcast by local civil defense authorities.
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