Preliminary FEM analysis of the local deformation around the 62-II eruptive vent at Mt. Tokachi
Bibliographic Information
- Other Title
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- 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
- ユウゲン ヨウソホウ ニ ヨル トカチダケ 62-Ⅱ カコウ シュウヘン ノ キョクショテキ チカク ヘンドウ ノ ヨビ カイセキ
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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.
Journal
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- 北海道大学地球物理学研究報告
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北海道大学地球物理学研究報告 78 11-18, 2015-03-19
北海道大学大学院理学研究院
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Details 詳細情報について
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- CRID
- 1390572174747765632
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- NII Article ID
- 120005572446
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- NII Book ID
- AN0008976X
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- HANDLE
- 2115/58237
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- NDL BIB ID
- 026336133
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- ISSN
- 04393503
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- Text Lang
- ja
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- Data Source
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- JaLC
- IRDB
- NDL
- CiNii Articles
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- Abstract License Flag
- Allowed