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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第78号 >

有限要素法による十勝岳62-I I火口周辺の局所的地殻変動の予備解析

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Title: 有限要素法による十勝岳62-I I火口周辺の局所的地殻変動の予備解析
Other Titles: Preliminary FEM analysis of the local deformation around the 62-II eruptive vent at Mt. Tokachi
Authors: 奥山, 哲1 Browse this author
高橋, 浩晃2 Browse this author →KAKEN DB
Authors(alt): OKUYAMA, Satoshi1
Issue Date: 19-Mar-2015
Publisher: 北海道大学大学院理学研究院
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 78
Start Page: 11
End Page: 18
Abstract: We present the result of our preliminary FEM analysis of local deformation at Mt. Tokachi. Since 2006, displacement of several cm/yr has been observed by GPS measurement and SAR interferometry at 62-II eruptive vent which was formed by the eruptive event in 1962. The spatial scale of the deformation observed by SAR interferometry is around 2 km. This indicates that the deformation source is at the depth of less than 1 km, supporting that the deformation source is the hydrothermal activity rather than the magma chamber. As a preliminary analysis, we assumed spheroidal pressure source beneath the 62-II vent and simulated the surface deformation to observe the relation between the surface deformation and source depth/shape. We then compared the simulated deformation and SAR interferometry result to find that prolate spheroid (flattening of 0.8) at the depth of 200 m best explains the observation.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第78号

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