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

Kan OKUBO  Akihiro TAKEUCHI  Yukinobu NAKAMURA  Nobunao TAKEUCHI  

IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.1   pp.110-114
Publication Date: 2012/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.110
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electromagnetic Compatibility
electromagnetic observation,  co-seismic signal,  electrostatic field,  earthquake,  underground observation,  

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