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Electric Signals on and under the Ground Surface Induced by Seismic Waves
Joint Authors
Takeuchi, Nobunao
Takeuchi, Akihiro
Okubo, Kan
Source
International Journal of Geophysics
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-02-22
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
We constructed three observation sites in northeastern Japan (Honjo, Kyowa, and Sennan) with condenser-type large plate electrodes (4 × 4 m2) as sensors supported 4 m above the ground and with pairs of reference electrodes buried vertically at 0.5 m and 2.5 m depth (with a ground velocity sensor at Sennan only).
Electrical signals of an earthquake (M6.3) in northeastern Japan were detected simultaneously with seismic waves.
Their waveforms were damped oscillations, with greatly differing signal amplitudes among sites.
Good positive correlation was found between the amplitudes of signals detected by all electrodes.
We propose a signal generation model: seismic acceleration vertically shook pore water in the topsoil, generating the vertical streaming potential between the upper unsaturated water zone and the lower saturated water zone.
Maximum electric earth potential difference was observed when one electrode was in the saturated water zone, and the other was within the unsaturated water zone, but not when the electrodes were in the saturated water zone.
The streaming potential formed a charge on the ground surface, generating a vertical atmospheric electric field.
The large plate electrode detected electric signals related to electric potential differences between the electrode and the ground surface.
American Psychological Association (APA)
Takeuchi, Akihiro& Okubo, Kan& Takeuchi, Nobunao. 2012. Electric Signals on and under the Ground Surface Induced by Seismic Waves. International Journal of Geophysics،Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-459142
Modern Language Association (MLA)
Takeuchi, Akihiro…[et al.]. Electric Signals on and under the Ground Surface Induced by Seismic Waves. International Journal of Geophysics No. 2012 (2012), pp.1-10.
https://search.emarefa.net/detail/BIM-459142
American Medical Association (AMA)
Takeuchi, Akihiro& Okubo, Kan& Takeuchi, Nobunao. Electric Signals on and under the Ground Surface Induced by Seismic Waves. International Journal of Geophysics. 2012. Vol. 2012, no. 2012, pp.1-10.
https://search.emarefa.net/detail/BIM-459142
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-459142