静岡県富士・富士宮地区およびその周辺の活断層について

概要

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This district is located on the southwest of Mt. Fuji, the south part of the Fossa Magna area. The Agoyama active fault extends from north to south, between a hill named Habuna and the skirt of Mt. Fuji. Another active fault so-called Ohmiya fault, runs from NW to SE, between a hill of Hoshiyama and the Mt. Fuji. The Fujikawa Fault trend-ing north to south, traverse the eastend of the later hill, extends to the Suruga Trough. All these faults are concealed with volcanic ash, so that these fault lines are not accurately known. Therefore, in order to discriminate these faults, linear features have been delineated, using Landsat images and stereo airphotos. Successively, γ-ray dose rates have been measured along the lines across these faults to confirm the precise position of the faults. γ-ray dose rates obtained on the points of these faults seem to show rather higher figures than those of other points.