Tsunami 22
Tsunami 22 : A series of travelling waves of extremely long length and period, generated by disturbances associated with earthquakes occurring below or near the ocean floor. Also called: seismic sea wave and, popularly, tidal wave: An ocean wave produced by a submarine earthquake, landslide, or volcanic eruption. These waves may reach enormous dimensions and have sufficient energy to travel across entire oceans. They proceed as ordinary gravity waves with a period between 15 and 60 minutes. Tsunamis steepen and increase in height on approaching shallow water, inundating low-lying areas; and where local submarine topography causes extreme steeping, they may break and cause great damage. Tsunamis have no connection with tides; the popular name is entirely misleading
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