Type:		Journal, Article
Title:		Observations of earthquake waves by the vertical earth potential difference method
Author(s):		Takeuchi, N.; Chubachi, N.; Narita, K.
Date:		1997/4
Abstract:		It is still not clear what relationship exists between earthquake phenomena and electromagnetic ones. The earth self-potential difference has been observed with high time resolution for continuously monitoring earthquakes at Sendai, where artificial leakage current sources always exist. A simple method to reduce the unnecessary signals induced by artificial and natural earth current sources is proposed. With this method the potentil difference is measured through two electrodes buried at different vertical positions under the ground. For all earthquakes with seismic intensities of more than 1 at Sendai we have observed clear variations in the potential difference signal. The observed electric P and S wave arrival times agree exactly with seismic data obtained by the Japan Meteorological Agency (JMA).
Journal (full):		Physics of the Earth and Planetary Interiors
Volume:		101
Issue:		1-2
Start Page:		157
End Page:		161
ISSN/ISBN/DOI:		http://dx.doi.org/10.1016/S0031-9201(96)03211-6
Link:		http://www.sciencedirect.com/science/article/pii/S0031920196032116