Self-potential anomaly of Satsuma-Iwojima volcano
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- Kanda Wataru
- Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University
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- Mori Sin'yo
- Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University
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抄録
We conducted self-potential (SP) surveys twice at Satsuma-Iwojima volcano where an intense fumarolic activity continued for more than 1000 years from a summit crater of Iwodake, a lava dome of rhyolite. A positive anomaly of 200 - 250 mV was detected on the Iwodake edifice, although the survey area was limited because of the steep topography and existence of high temperature fumaroles. The anomaly seems to be centered at the summit crater of Iwodake and can roughly be explained by a pair of conduction current source and sink located around the sea level beneath the summit crater. Depth of the current source might indicate the upper end of a liquid-phase water upflow zone, where the liquid-phase water vaporizes due to heat and depressurization. The above model does not explain the additional positive SP anomaly around the summit crater and on the western flank. The anomaly around the summit might be caused by suppression of meteoric water downflow by high temperature volcanic gases. The positive anomaly on the western flank might be caused by local fluid upflows associated with fumaroles on the flank.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (3), 231-237, 2002
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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- CRID
- 1390001206513525504
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- NII論文ID
- 10008634633
- 130003956293
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6262954
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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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