二周波法によるVHF帯地震電磁現象の観測

概要

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Seismic electromagnetic (EM) phenomena have been observed at many laboratories with specially designed systems. Recently we can utilize radio receivers, personal computers and communication systems with higher performances and reasonable cost. It is possible to observe seismic EM phenomena not only by specially designed systems but also by a simple observation system integrated by these devices and systems. So, we have realized an observation system for seismic EM phenomena with them in very high frequency (VHF) band, from 76MHz to 90MHz, assigned for FM broadcasting exclusive use in Japan. We are surrounded with many EM waves such as broadcasting, communication usage and manmade-noises. So, we have newly developed the dual frequency observation method. In this paper, we describe that the observation method can identify whether a received signal is a broadband EM wave or an artificial FM radio wave. Next, the observation results are shown as broadband EM waves of galactic noise and solar flare. Then, the observation results are shown as FM radio waves reflected from sporadic E layer and the Leonid meteors. Finally, the observation results of the detected broadband EM waves associated with the Geiyo earthquake are described.
2005-06-01