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Sensors 2007, 7(7), 1108-1122; doi:10.3390/s7071108

Monitoring of ULF (Ultra-Low-Frequency) Geomagnetic Variations Associated with Earthquakes

1,* , 2
1 Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan 2 Faculty of Science, Chiba University, 1-33 Yayoi, Inage Chiba 263-8522, Japan 3 Department of Electronics, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi 487-8501, Japan
* Author to whom correspondence should be addressed.
Received: 14 June 2007 / Accepted: 26 June 2007 / Published: 4 July 2007
(This article belongs to the Special Issue Sensors for Disaster and Emergency Management Decision Making)
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ULF (ultra-low-frequency) electromagnetic emission is recently recognized as one of the most promising candidates for short-term earthquake prediction. This paper reviews previous convincing evidence on the presence of ULF emissions before a few large earthquakes. Then, we present our network of ULF monitoring in the Tokyo area by describing our ULF magnetic sensors and we finally present a few, latest results on seismogenic electromagnetic emissions for recent large earthquakes with the use of sophisticated signal processings.
Keywords: Seismogenic ULF emissions; earthquake prediction; magnetic sensors; signal processing Seismogenic ULF emissions; earthquake prediction; magnetic sensors; signal processing
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Hayakawa, M.; Hattori, K.; Ohta, K. Monitoring of ULF (Ultra-Low-Frequency) Geomagnetic Variations Associated with Earthquakes. Sensors 2007, 7, 1108-1122.

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