Traces of Earthquake on Ocean Bed
sediment. Moreover, sediment samples taken from a depth of 7,700 meters reveal evidence of other mega earthquakes which occurred in the Earth’s past history. Leader of the expedition, which was funded by [...] proximity of the Japanese deep-sea trench had been shifted some 50 meters by the earthquake and some areas off the coast around Honshu by up to five meters to the East. Specially devised echo-sounders on [...] corer, a sort of hollow cylinder, they brought a total of 95 meters of sediment core 12 centimeters in diameter to the surface. The samples were taken from depths of about 1,350 to 7,550 meters, both
