An earthquake is a phenomenon in which a normally solidly attached subterranean ground or rock bed suddenly shifts with at a certain boundary. It also means quaking of the ground surface caused by this shift. A plate-type earthquake is also called an ocean-type earthquake, which occurs at a boundary between different plates. This earthquake occurs when a plate pushed up by the other plate that starts to slide underneath the plate springs back because it can no longer absorb the strain, and it is repeated in a certain cycle unless a significant change occurs in the actions of the Earth. In the case of Japan, most of the earthquakes are ocean-type because most of the boundaries of the plates are under the sea. The Great Kanto Earthquake, Tokachi offshore earthquakes and other M8 class earthquakes are of this type.
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