赤石裂線の位置

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The Akaishi Tectonic Line is traced from Misakubo Town to Tenryu City, Shizuoka Prefecture. The Akaishi Tectonic Line Research Group made a survey of the Line for about 38 km from Misakubo Town in the north to Tenryu City in the south, on the premises that the Tectonic Line is a boundary between the Akaishi Sphenoid to the east and the Toyohama Block to the west. To the north the tectonic line joins with the Median Tectonic Line, while it is covered by the Alluvial sediments in the south. It trends generally from north to south along the east side of the River Tenryu and the River Misakubo, a tributary of the Tenryu, and it inclines to the east. According to our survey, the Akaishi Tectonic Line is divided into three parts, namely the northern part from Ryuto to Banjizawa, the central part from Nagozawa to Tokura, and the southern part from Tokuradani to Tenryu City. In the northern part it is traced from Ryuto to Fukuzawa through Mukagaito and Aizuki. In this part it shows such fault topography as kern buts and kern cols. The strike of the fault is from N-S to NNE-SSW, and the dips range from 30 degrees to 50 degrees toward east. Fracture zones, generally about 10 m wide, are observed in Mukagaito, Botarokuzawa, Aizuki and Sendo. In the central part the Tectonic Line trends from NNE to SSW, and the dips are very low being from 5 degrees to 15 degrees. Differences in topography on both sides of the Tectonic Line are remarkable. The fault line does not exactly agree with the position of kern cols, In the southern part the Tectonic Line is traced from Tokuradani to Futamata-honmachi through Higashiunna, Saku, Osawa, Funagira and Oya. The strike of fault is NNE-SSW, and the dips are from 20 degrees to 40 degrees.
日本地質学会の論文
1976-12-30

赤石裂線の位置

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