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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 19 (1935)

Issue: 1. (January)

First Page: 58

Last Page: 63

Title: Study of Structure of Suwa Basin Near Kyoto, Japan, by Torsion Balance

Author(s): M. Matsuyama, Y. Fujita, H. Higashinaka (2)


The origin of the Suwa Basin near Kyoto, Japan, was sought from the geophysical standpoint by use of the torsion balance. An isogam map suggests Lake Suwa as a crater lake, but this conclusion is not reasonable from a geological standpoint. Therefore, the origin of the lake seems to be in subsidence following the eruption of Yatsugadake Mountain, near by.

The gravity field of the basin is negative while that of the mountains which surround the basin is positive. Hence, from the standpoint of isostasy, the deficiency of the subterranean mass is clear, and shows that the basin is a result of faulting or subsidence.

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