Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
Original Papers
Heterogeneous electrical structure of Kozu-shima volcanic island, Japan
Yoshiaki ORIHARAMasashi KAMOGAWAToshiyasu NAGAOSeiya UYEDA
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2009 Volume 85 Issue 10 Pages 476-484

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Abstract

Nearly twenty anomalous geoelectric field changes were observed before earthquakes at Kozu-shima Island, Japan, from 1997 to 2000. In order to help locating the current sources of the observed anomalous changes, a bipole-dipole resistivity survey was conducted. From the resistivity survey, including current injection into the ground, it was found that various features of the anomalous changes were systematically different from those of changes caused by artificial sources and induction of geomagnetic disturbances. Moreover, it is suspected that the currents of anomalous changes were generated not near the ground surface but deep under the ground.

(Contributed by Seiya UYEDA, M.J.A.)

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© 2009 The Japan Academy
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