Tsunami (Japan: bo jin tsunami waves at Tsu NAMI, "harbor wave" or "coast"?) are a group of water wave caused by moving the water volume of the ocean or Lake is a large, large earthquakes. The eruption of a volcano, and other underwater explosions (including ignition nuclear explosives under water). The soil avalanche glacier and to skid the other meteorites disturbed. Plain water, whether above or below could cause a tsunami.