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| | Abstract | | Fujikawa-kako faults group is present to the periphery southwest at the foot of Mt. Fuji from around Fujikawa estuary. To the west of Fujikawa River it is said that Iriyamase fault and Zenpukuji fault are located in the southern end of the Fujikawa fault zone. In the present study, it was carried out gravity survey using LaCoste & Romberg gravity meter in order to make an estimate of subsurface structures the west part of Fujikawa River. It was set two Survey line. One was the survey line 1 of the total length 5.6km on coastal areas of Fujikawa estuary west, and the other was the survey line 2 of the total length 1.1km on place went 2 km inland from Fujikawa estuary. As a result of the investigation, we were able to create a density structure model suggests a folded structure of the underground. Looking at the density structure model, there is a possibility of rock body of Iwabuchi andesites over the sea from the land at the west side of the Zenpukuji fault. In addition, eastern from Iriyamase fault, we were able to see the density structure that indicates the high density of the rock body which continuously over the sea from the land. |
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