2004年新潟県中越地震に伴う自然電位の異常変化の観測

概要

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Abnormal changes of self-potential were observed at Tokyo(SET)and Yokosuka(YST), related to the occurrence of the 2004 Mid Niigata Prefecture with magnitude of 6.8. The epicentral distances to SET and YST are 170km and 220km, respectively. The abnormal changes of self-potential started a half or one month before the main shock, and lasted about one month after the main shock.One of remarkable characteristics is that several large aftershocks with magnitude of 6 or more followed the main shock within about one month, which corresponds to the period when the abnormal changes of the self-potential were observed. It suggests that some remarkable changes of the earth's crust under the epicentral region occurred when the abnormal changes were observed.
関東学院大学工学総合研究所の論文