Crustal deformation associated with the 1998 seismo-volcanic crisis of Iwate Volcano, Northeastern Japan, as observed by a dense GPS network
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- Miura Satoshi
- Graduate School of Science, Tohoku University
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- Ueki Sadato
- Graduate School of Science, Tohoku University
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- Sato Toshiya
- Graduate School of Science, Tohoku University
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- Tachibana Kenji
- Graduate School of Science, Tohoku University
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- Hamaguchi Hiroyuki
- Graduate School of Science, Tohoku University
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抄録
Mt. Iwate (2, 038 m) is an active volcano located in northeastern Japan. Unrest of the volcano started in September, 1995 with intermediate-depth tremors. The shallow seismicity gradually became active in February, 1998, accompanying the notable crustal deformation observed by a dense GPS network. The pattern of the horizontal displacements is characterized by radially directing outward from the volcano. We estimated the source position by inversion analyses for every two-months period, assuming two models; a point pressure source (Mogi model) and a tensile fault. The comparison of AIC's for the two models indicates that the latter is proper from February to April, while the former is preferable afterward. The tensile fault was located at about 5 km WSW of the summit and 3 km in depth, then a Mogi source was estimated at the western neighbor of the tensile fault in the successive period and moved westward as far as 10 kmWof the summit with shallowing its depth. It should be noted that the seismic area also expanded westward in the same period. This synchronicity suggests that the both phenomena were caused by a movement of magma from the deeper part beneath the summit to the western shallower part.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 52 (11), 1003-1008, 2000
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報
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- CRID
- 1390282681490896512
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- NII論文ID
- 10006712523
- 130003956106
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
- http://id.crossref.org/issn/13438832
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- NDL書誌ID
- 5606121
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
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