顕著な地震と火山活動に伴う自然電位の異常変化--過去の資料の再検討と新しい事象の追加

概要

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Self-potential have been observed at KJM(northern part of Nagano Prefecture),SET(Setagaya-ku of Tokyo Metropolis),and YST(Shonan-Takatori,Yokosuka City of Kanagawa Prefecture). We related abnormal temporal changes of self potential to large earthquakes and remarkable volcanic eruptions in the papers already published. In this paper,we will re-analyze the past records and try to detect the new events from the records obtained after the former studies. We detected totally forty abnormal events of the self-potential related to the remarkable earthquakes and volcanic eruptions from 1983 to 2008,including the four events from re-analysis of the past records and six new events. Large earthquakes and gigantic volcanic eruptions,which occurred less than distance of 1000 km,can be detected by the self-potential phenomena.