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When it touches the shore, tsunamis can severely change the coastal landscape through rapid erosion.

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A person can tell when a tsunami happens by seeing when the water in the beach gets reduce on the shore and when the water is going backwards.

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Some countries use tsunami buoys observe and record changes in the sea level from undersea earthquakes.

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Some other countries use a pressure sensor anchored to the sea floor

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I believe people will soon have tsunami safe houses.

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People will somtetimes get notified "Tsunami Warning" on there phone if there not at the beach to evacuate early

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You should always have an evacuation plan, especially when you are in tsunami-prone areas. But if you don't have one and you get a warning, get on to high ground a wait for further instructions. DO NOT get back down after the first one, as there will be multiple waves, each one bigger than the last.