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anafranil 25mg For one, the earthquake occurred in a subduction zone, an area in which one tectonic plate is diving underneath another. In this case, the Pacific plate plunged beneath the North American plate. Typically, earthquakes displace plates by less than 20 meters (about 66 feet), but in the Tohoku earthquake, the slip was up to 50 meters (164 feet). Also unusual in this situation, researchers said, was the fact that the earthquake ruptured all the way up to the sea floor.