地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
3.2 硫黄島における臨時地震観測と常時微動 (付隆起モデル)
笠原 稔江原 幸雄
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1985 年 94 巻 6 号 p. 464-473

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Eight temporal seismic observations ranging 2 to 90 days in 1968-1978 revealed that the seismicity of the island is usually very low inspite of its large and continuous upheaval and that the focal region is limitted in its topographical caldera with depth lower than 3-4 km. Microtremor related to a thermal activity is only observed near the active fumaroles on the island and another kind of tremor which is closely related to the surface geologic features is commonly observed on the whole island. We propose an upheaval model which consists of two P10 (cos θ) type pressure sources which are located beneath the Chidori-gahara with depth in 1-2 km and the north-east coast of the island with depth 3-4 km.

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