Japan Trench

Japanese: 日本海溝 - にほんかいこう

A trench east of Honshu. In the north, it borders the Kuril-Kamchatka Trench off Cape Erimo, and the Erimo Seamount is located on the trench axis at this junction. In the south, it borders the Izu-Ogasawara Trench off the southeast coast of the Boso Peninsula. This border is near where the deep area that leads to Sagami Bay branches off. The total length is about 800 km. There are two to three submarine terraces on the continental slope. From 2,400 to 3,400 m deep, the trench slope is steep with many steps. On the ocean side, from 5,600 to 6,000 m deep, a long, narrow depression parallel to the trench forms the trench slope. The trench floor is V-shaped, and there are few places where a flat bottom is developed. The trench depth is deeper in the south, reaching over 9,000 m where it borders the Izu-Ogasawara Trench. However, because this area is topographically connected to the Izu-Ogasawara Trench, the deepest point of the Japan Trench is 8,058 m off the coast of Kashima-Nada, to the north. In the past, the three trenches of the Kuril-Kamchatka, Japan, and Izu-Ogasawara were collectively called the Japan Trench, but due to the correspondence between trenches and island arcs, it was divided into three, and this was also recognized in the international unification of place names in 1962.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

本州東方の海溝。北は襟裳(えりも)岬沖で千島・カムチャツカ海溝と接し，この接合点の海溝軸に襟裳海山がある。南は房総半島南東沖で伊豆・小笠原海溝と接する。この境界は相模湾へ続く深所が分岐する付近である。全長約800km。大陸斜面には２〜３段の海底段丘がある。2400〜3400m以深は多数の階段をなす海溝斜面となって急斜する。大洋側は5600〜6000m以深に海溝に並行の細長い凹地を境にして海溝斜面となる。海溝底はV字形で平らな底が発達する所は少ない。海溝水深は南ほど深く，伊豆・小笠原海溝に接する部分で9000m以上に達する。ただしここは伊豆・小笠原海溝と地形的には一連となっているため，日本海溝最深所はその北の鹿島灘沖8058m。かつて千島・カムチャツカ，日本，伊豆・小笠原の３海溝をあわせて日本海溝と称したが，海溝と島弧の対応性から３分され，1962年の国際的地名統一にも認められることになった。
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