Tanna Basin

Japanese: 丹那盆地 - たんなぼんち

A small basin on the western slope of Taga Volcano, at the base of the Izu Peninsula in eastern Shizuoka Prefecture. It is 235m above sea level and is almost circular. Small basins such as Karuizawa and Tashiro are connected to it. The floor of the basin is said to have once been a lake, and Jindai cedars are buried there. Rice fields have been opened up, and dairy farming is carried out on the surrounding slopes. During the 1930 North Izu earthquake, the eastern side of the fault moved horizontally 2.6m north, and the fault that appeared within the basin has been designated a natural monument. The JR Tokaido Main Line and the Tokaido Shinkansen run through tunnels under the basin.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

静岡県東部，伊豆半島の基部，多賀火山西斜面にある小盆地。標高 235m。ほぼ円形をなす。軽井沢，田代などの小盆地が連続している。盆地床はかつては湖であったといわれ，神代杉が埋もれている。田畑が開かれ，周囲の斜面では酪農が行われる。 1930年の北伊豆地震のとき，断層を境に東側が北に 2.6m水平移動し，盆地内に現れた断層は天然記念物に指定されている。 JR東海道本線，東海道新幹線は，この盆地の下をトンネルで通っている。

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