Abstract
East Sea is also called Sea of Japan. It is a semi-enclosed marginal sea or back-arc basin surrounded by the East Asian continent and the Japanese Islands. The upper crust (layer 2), mainly composed of basaltic sills and lava flows possibly interlayered with sediment layers, occurs at a depth of 4 km below sea level in the Ulleung and Yamato basins and at about 6 km below sea level in the Japan Basin. Japan Basin in the northern part of the sea is 200–300 km wide and 700 km long trending Northeast–Southwest. Its basin floor ranges in water depth from 3,500 to 3,700 m and the deepest portion is located between Sikhote-Alin and the southwestern part of Hokkaido. The floors of the Japan and Yamato basins are rather smooth and flat except for a few seamounts and hills that rise up to 2,000 m above the surrounding basin floor. The South Korea Plateau is characterized by ridges, seamounts, and troughs. The North Korea Plateau is bounded in the north by the Wonsan Trough. The two ridges are partly separated by the Japan Basin.
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