Subterranean electrical structure of Kozu-shima volcanic island, Japan
スポンサーリンク
概要
- 論文の詳細を見る
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.(Communicated by Seiya UYEDA, M.J.A.)
著者
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Nagao Toshiyasu
Earthquake Prediction Res. Center Tokai Univ.
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KAMOGAWA Masashi
Department of Physics, Tokyo Gakugei University
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ORIHARA Yoshiaki
Earthquake Prediction Research Center, Tokai University
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Takeuchi Akihiro
Earthquake Prediction Research Center Institute Of Oceanic Research And Development Tokai University
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FUKASE Hiroaki
Earthquake Prediction Research Center, Tokai University
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TAKEUCHI Akihiro
Earthquake Prediction Research Center, Tokai University
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