Subterranean electrical structure of Kozu-shima volcanic island, Japan
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- ORIHARA Yoshiaki
- Earthquake Prediction Research Center, Tokai University
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- KAMOGAWA Masashi
- Department of Physics, Tokyo Gakugei University
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- TAKEUCHI Akihiro
- Earthquake Prediction Research Center, Tokai University
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- FUKASE Hiroaki
- Earthquake Prediction Research Center, Tokai University
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- NAGAO Toshiyasu
- Earthquake Prediction Research Center, Tokai University
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Abstract
Following the electric current injection experiment carried out in 2009, a VLF-MT (Very Low Frequency Magnetotelluric) survey has been conducted in Kozu-shima Island to obtain further information on the subterranean electrical structure that might help understanding the results of our monitoring of geoelectric potentials. A number of VAN-type pre-seismic geoelectric potential anomalies were observed in 1997–2000, even showing a remarkable “Selectivity”. However, similar pre-seismic anomalies were not observed during the Izu-Island volcano-seismic swarm 2000. All these observations would require extremely high degree of heterogeneity in the subterranean electrical structure of the volcanic island and its possible time changes. Several correlations between the results of this survey and the volcanic geology of the island and ground water distribution were found. Further investigation is needed for a complete explanation of the observed phenomena.<BR><BR>(Communicated by Seiya UYEDA, M.J.A.)
Journal
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- Proceedings of the Japan Academy, Series B
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Proceedings of the Japan Academy, Series B 86 (9), 914-919, 2010
The Japan Academy
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Details 詳細情報について
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- CRID
- 1390001204146130048
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- NII Article ID
- 130000442360
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- NII Book ID
- AA00785485
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- ISSN
- 13492896
- 03862208
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- NDL BIB ID
- 10942557
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed