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Monitoring of ULF (Ultra-Low-Frequency) Geomagnetic Variations Associated with Earthquakes
Sensors 2007, 7(7), 1141-1158; doi:10.3390/s7071141
Article

VLF/LF Radio Sounding of Ionospheric Perturbations Associated with Earthquakes

Department of Electronic Engineering and Research Station on Seismo Electromagnetics, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
Received: 18 June 2007 / Accepted: 5 July 2007 / Published: 10 July 2007
(This article belongs to the Special Issue Sensors for Disaster and Emergency Management Decision Making)
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Abstract

It is recently recognized that the ionosphere is very sensitive to seismic effects,and the detection of ionospheric perturbations associated with earthquakes, seems to bevery promising for short-term earthquake prediction. We have proposed a possible use ofVLF/LF (very low frequency (3-30 kHz) /low frequency (30-300 kHz)) radio sounding ofthe seismo-ionospheric perturbations. A brief history of the use of subionospheric VLF/LFpropagation for the short-term earthquake prediction is given, followed by a significantfinding of ionospheric perturbation for the Kobe earthquake in 1995. After showingprevious VLF/LF results, we present the latest VLF/LF findings; One is the statisticalcorrelation of the ionospheric perturbation with earthquakes and the second is a case studyfor the Sumatra earthquake in December, 2004, indicating the spatical scale and dynamicsof ionospheric perturbation for this earthquake.
Keywords: Ionospheric perturbations; VLF/LF radio sounding; earthquake prediction Ionospheric perturbations; VLF/LF radio sounding; earthquake prediction
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Hayakawa, M. VLF/LF Radio Sounding of Ionospheric Perturbations Associated with Earthquakes. Sensors 2007, 7, 1141-1158.

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