2024-03-29T13:35:24Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/582372022-11-17T02:08:08Zhdl_2115_58231hdl_2115_13714hdl_2115_116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Preliminary FEM analysis of the local deformation around the 62-II eruptive vent at Mt. Tokachi奥山, 哲OKUYAMA, Satoshi1000030301930高橋, 浩晃TAKAHASHI, Hiroakiopen access450We 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.北海道大学大学院理学研究院2015-03-19jpndepartmental bulletin paperVoRhttps://doi.org/10.14943/gbhu.78.11http://hdl.handle.net/2115/5823710.14943/gbhu.78.110439-3503AN0008976X北海道大学地球物理学研究報告Geophysical bulletin of Hokkaido University781118https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/58237/1/GBHU_78_p11-.pdfapplication/pdf6.1 MB2015-03-19