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

Kan OKUBO; Akihiro TAKEUCHI; Yukinobu NAKAMURA; Nobunao TAKEUCHI

doi:10.1587/transele.E95.C.110

IEICE Transactions on Electronics

Online ISSN : 1745-1353
Print ISSN : 0916-8524

Special Section on Recent Progress in Electromagnetic Theory and Its Application

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

Kan OKUBO, Akihiro TAKEUCHI, Yukinobu NAKAMURA, Nobunao TAKEUCHI

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Keywords: electromagnetic observation, co-seismic signal, electrostatic field, earthquake, underground observation

JOURNAL RESTRICTED ACCESS

2012 Volume E95.C Issue 1 Pages 110-114

DOI https://doi.org/10.1587/transele.E95.C.110

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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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