Sagami Bay - Sagami Bay

This refers to the sea area between a line that runs from the southern tip of the Izu Peninsula in Shizuoka Prefecture through Oshima to the southern tip of the Boso Peninsula, and a line that connects Manazuru Misaki in Kanagawa Prefecture to the southern tip of the Miura Peninsula (Jogashima). A 1,500-2,000 meter deep sea channel can be seen from the eastern part of Oshima toward the mouth of the Sakawa River, and this underwater topography continues to the Japan Trench in the eastern part of the Izu Islands. From a broader perspective, this corresponds to the Sagami Trough, which is related to the Fossa Magna that runs southeast through the center of Honshu, and the seafloor displacement caused by the Great Kanto Earthquake is also said to have been caused by the activity of the Sagami Trough in this tectonic zone. A branch of the Kuroshio Current flows in between the Izu Peninsula and Oshima, and flows out into the Pacific Ocean off Nojimazaki. Yellowtail fixed net fishing is carried out on the east coast of the Izu Peninsula, and there are many fishermen from Hokuriku and other areas. There are many good fishing grounds for offshore fishing in the southwestern coast of Boso (Chiba Prefecture) and around Oshima, and fishing boats are also sent out from the Miura Peninsula. In addition to regular ferries that run from Keihin and Izu (Atami and Ito) to Oshima, there are many domestic and international cargo ships operating there.

[Yukio Asaka]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

静岡県、伊豆半島の南端から大島を経て房総半島南端に至る線と、神奈川県の真鶴岬(まなづるみさき)と三浦半島南端（城ヶ島(じょうがしま)）とを結ぶ線との間の海域をいう。大島の東部から酒匂(さかわ)川河口に向かって水深1500～2000メートルの海渠(かいきょ)がみられるが、この海底地形は、伊豆諸島東部の日本海溝に続くものである。大きくみると、これは本州の中央部を南東に縦断するフォッサマグナに関連する相模トラフにあたり、関東大地震の海底の変位も、この構造地帯の相模トラフの活動によるものとされている。黒潮の分流は伊豆半島と大島の間から流入し、野島崎沖から太平洋に流出する。伊豆半島東岸ではブリの定置網漁業が行われ、北陸その他からの出漁者も少なくない。房州（千葉県）の南西沖と大島近海には沖合漁業の好漁場が多く、三浦半島からも出漁している。京浜、伊豆（熱海(あたみ)、伊東）から大島への定期船が通うほか、国内間、国際間の貨物船の運航が多い。

［浅香幸雄］

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