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Remote detection of the electric field change induced at the seismic wave front from the start of fault rupturing

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doi: 10.1155/2011/752193
Authors:Fujinawa, Yukio; Takahashi, Kozo; Noda, Yoichi; Iitaka, Hiroshi; Yazaki, Shinobu
Author Affiliations:Primary:
Risk Management Association, Tokyo, Japan
Other:
Communication Research Laboratory, Japan
Real-Time Earthquake Information Consortium, Japan
National Institute of Advanced Industrial Science and Technology, Japan
National Research Institute for Earth Science and Disaster Prevention, Japan
Volume Title:International Journal of Geophysics
Source:International Journal of Geophysics, Vol.2011. Publisher: Hindawi, London, International. ISSN: 1687-885X
Publication Date:2011
Note:In English. 52 refs.; illus., incl. sketch map
Summary:Seismic waves are generally observed through the measurement of undulating elastic ground motion. We report the remote detection of the Earth's electric field variations almost simultaneously with the start of fault rupturing at about 100 km from the fault region using a special electric measurement. The rare but repeated detection indicates that the phenomenon is real. The characteristic time of diffusion is almost instantaneous, that is, less than 1 second to travel 100 km, more than ten times faster than ordinary seismic P wave propagation. We suggest that the measured electric field changes are produced by the electrokinetic effect through increased pore water pressure of the seismic pulse. It is also suggested that the long range propagation is due to the surface wave mode confined near the interface of the different conductivity. The length scale of the finite strength of the electric field is 16 km, 160 km for electric conductivity of 0.01, 0.001, Sm-1, respectively. This phenomenon suggests a new seismic sensing method and a new earthquake early warning system providing more seconds of lead time.
Subjects:Body waves; Conductivity; Coseismic processes; Early warning systems; Earthquakes; Elastic waves; Electrical conductivity; Electrical field; Faults; Geophysical methods; Ground motion; Guided waves; P-waves; Pore pressure; Propagation; Rupture; S-waves; Seismic methods; Seismic waves; Surface waves; Warning systems
Coordinates:N350000 N363000 E1410000 E1393000
Record ID:812952-7
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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