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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
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
| 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 | | TAKAHASHI, Hiroaki2 |
| 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) |
| URI: | http://hdl.handle.net/2115/58237 |
| 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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