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Warning Signs of a Tsunami
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A large-scale earthquake lasting for more than twenty seconds can be the precursor for a tsunami. When a region is hit by an earthquake of large magnitude, you should be aware that coastal regions located near the earthquake’s epicenter could be hit by a tsunami.
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A more immediate warning sign of a tsunami is the rapid and unexpected decline of water level, below what is normal during low tie. This can happen for a few minutes before the coast is hit by a tsunami and is the only sign along coasts that are located too far away from the epicenter for the earthquake to be felt.
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A tsunami can just as often occur without any warning signs.
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The Seismological Society of America monitors these events at any time of day. When a tsunami does occur, they try to give the earliest possible warning to the media in regions that are likely to be affected.
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The Communication and Traffic Services of the U.S. Coast Guard will also release maritime warnings in case of a tsunami.
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When you become aware of a tsunami warning, seek higher ground if possible.
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