Sagami Bay

It refers to the sea area north of the line connecting Cape Manazuru in western Kanagawa Prefecture and the southern tip of the Miura Peninsula (Jogashima). A 1,000-1,200-meter-deep sea channel can be seen in the western part of the bay, but this underwater topography is due to the Sagami Trough, which runs from the northwest of Sagami Bay to the Japan Trench (eastern Izu Islands), and the subsidence of the seabed that occurred during the Great Kanto Earthquake in 1923 (Taisho 12) is said to have been caused by activity in this tectonic zone. The coastal currents flow strongly eastward from the mouth of the Sagami River to the west coast of the Miura Peninsula, and then southeastward. At the mouths of the Sakai River (Fujisawa City), Tagoe River (Zushi City), and Morito River (Hayama Town), sandbars have developed toward the east and south. Due to these seabed and coastal topography, natural fishing reefs have developed more widely in the eastern part of the island than in the western part, and the entire eastern part of the island is a good fishing ground for horse mackerel and mackerel fishing and longline fishing. In addition, the area south of Enoshima and the area west of Yokosuka and Miura are good fishing grounds for squid fishing, and the area south of Odawara from Kataura to Cape Manazuru is good fishing grounds for horse mackerel and mackerel fishing. Fixed net fishing for yellowtail is carried out in Kataura, Manazuru, and Nishiura on the Miura Peninsula (Yokosuka), and Manazuru is also known for yellowtail net tourism.

[Yukio Asaka]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

神奈川県西部の真鶴岬(まなづるみさき)と三浦半島南端（城ヶ島(じょうがしま)）を結ぶ線から北の海域をいう。湾の西部に深さ1000～1200メートルの海渠(かいきょ)がみられるが、この海底地形は、相模湾の北西から日本海溝（伊豆諸島東部）に連なる相模トラフによるもので、1923年（大正12）の関東大地震のときにおこった海底の沈下現象は、この構造地帯の活動によるものとされている。沿岸潮流は相模川河口から三浦半島西岸へかけて東流、ついで南東流するものが強くみられ、境(さかい)川（藤沢市）、田越(たごえ)川（逗子(ずし)市）、森戸川（葉山町）諸川の河口部にはそれぞれ、東方また南方へ向けて砂州が発達している。こうした海底や沿岸地形によって天然漁礁は東部では西部よりも広く発達し、東部の全域がアジ、サバ釣りや延縄(はえなわ)の好漁場である。また、江の島南方沖合いや横須賀(よこすか)、三浦両市の西方沖合いはイカ釣り、小田原南方の片浦から真鶴岬の沖合いにかけてはアジ、サバ釣りの好漁場となっている。片浦と真鶴と三浦半島の西浦（横須賀市）ではブリの定置網漁業が行われ、真鶴はブリ網観光でも知られる。

［浅香幸雄］

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