Tsunamis

TSUNAMIS  () are giant waves created by seismic activity below the ocean floor. Travelling in a series, tsunamis spread outward at speeds of several hundred km/h, separated by gaps of 100 to 400 km. At sea they are not high and hardly betray their presence to ships as they pass. When they arrive on shore they sometimes bring nothing more than a gentle, if substantial, rise and fall in water levels. However, they can arrive in a cresting...

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