Absolute gravity change associated with the March 1997 earthquake swarm in the Izu Peninsula, Japan
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- Yoshida Shigeo
- Earthquake Research Institute, University of Tokyo
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- Seta Gaku
- Earthquake Research Institute, University of Tokyo
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- Okubo Shuhei
- Earthquake Research Institute, University of Tokyo
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- Kobayashi Shigeki
- Earth Observation Research Center, National Space Development Agency of Japan
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We carried out both absolute and relative gravity measurements in the Izu Peninsula just before and after the March 1997 earthquake swarm occurred. The measurements revealed significant absolute gravity changes, which we find to be made of three spatial components. The first one is located near Cape Kawana, and would be associated with the volcanic activity that caused the earthquake swarm. The second one would be associated with shallow and localized magma intrusion just beneath Ito. The third one may be due to a change in the deep region beneath the Kita-Izu fault system, which is considered to be a major tectonic line of this region. The gravity changes can be used to detect underground mass movement. For this purpose, we first use crustal movement observations to construct an elastic dislocation model with two tensile faults and a left lateral fault. Then we use the gravity changes to constrain the density of the material which filled the tensile faults. We find that the density is likely to be small, and that the gravity changes of the first component are reproduced well by the fault model. The smallness of the density implies that highly vesiculated magma or water would have injected into the faults.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 51 (1), 3-12, 1999
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 詳細情報について
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- CRID
- 1390001206510988800
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- NII論文ID
- 10003736949
- 130003955933
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 4657917
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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
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