Underground Electric Signal at the Occurrence of the Niigataken Chuetsu-oki Earthquake in 2007, Japan

  • OKUBO Kan
    Division of Information and Communications Systems Engineering, Tokyo Metropolitan University
  • TAKEUCHI Akihiro
    Earthquake Prediction Research Center, Institute of Oceanic Research and Development, Tokai University
  • NAKAMURA Yukinobu
    Hosokura Metal Mining Co. Ltd.
  • TAKEUCHI Nobunao
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University

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Abstract

The electric field mill in our underground observation room detected a co-seismic electromagnetic signal in the vertical electrostatic field ca. 8s after the origin time of the Niigataken Chuetsu-oki Earthquake in 2007, but ca. 30s before the arrival time of the P-waves.

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