Ishigakihara

A volcanic alluvial fan in the central north of Beppu City, Oita Prefecture. It spreads across the eastern foot of Mt. Ohira (Ougiyama, 792 meters), which is thought to be a remnant of the explosion of the former Tsurumi Stratified Volcano, and was formed by a mudflow from this former Tsurumi Stratified Volcano. The place's name is said to come from the fact that, during development, the rubble was removed and fences were built. In the Middle Ages, there was Ishigaki Sho, and in the early modern period, Ishigaki Village. In recent years, hot spring drilling and residential development have spread across the entire central fan, with only small areas of fields and pine forests remaining.

[Shunichi Kaneko]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

大分県別府市の中北部にある火山性扇状地。旧鶴見(つるみ)層状火山爆裂による残片と考えられる大平山(おおひらやま)（扇(おうぎ)山。792メートル）の東麓(とうろく)に広がり、形成はこの旧鶴見層状火山の泥流である。地名は、開発に際して岩礫(がんれき)を取り除いて垣をつくったことにちなむという。中世石垣庄(しょう)、近世石垣村があった。近年温泉掘削と住宅地化が扇央全面に及び、畑と松林は一部に残るだけとなった。

［兼子俊一］

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