Izu-Ogasawara Trench - Izu-Ogasawara Trench

Japanese: 伊豆･小笠原海溝 - いずおがさわらかいこう

The Izu-Ogasawara Trench is approximately 850 km long, running north-south from the Kashima Seamount off the coast of Inubosaki on the Boso Peninsula in the north to the Ogasawara Plateau southeast of the Ogasawara Islands in the south. Its deepest point (9,780 m deep) is located at 29°12' north latitude and 142°50' east longitude, northeast of the Ogasawara Islands. There is a zone of negative gravity free air anomalies (-300 mGal) along the trench axis, and the crustal heat flow is also low. It intersects with the Sagami Trough near 34° north latitude, southeast of Boso. The eastern side of the Izu-Ogasawara Trench is part of the Pacific Plate, and to the west of it, the area north of the Sagami Trough is considered to be the Eurasian Plate, and the area south of it is considered to be the Philippine Plate.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

北は房総半島犬吠埼沖の第一鹿島海山から，南は小笠原諸島南東方の小笠原海台まで，ほぼ南北に走る全長約850kmの海溝。最深部(水深9780m)は小笠原諸島北東の北緯29゜12′，東経142゜50′にある。海溝軸に沿って重力フリーエア異常の負(－300mGal)の帯があり，地殻熱流量も低い。房総南東の北緯34゜付近で相模トラフと交わる。伊豆･小笠原海溝の東側は太平洋プレートの一部であり，その西側では，相模トラフより北がユーラシアプレート，南がフィリピンプレートとされている。

出典　株式会社平凡社世界大百科事典第２版について　情報

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