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A seismic radiation emitted from the earth's crust is useful for predicting earthquakes. The electromagnetic (EM) wave in the Extremely Low Frequency (ELF) band have been observed at many places in Japan. In this paper, we propose the anomalous signal detection method based on HMM whose input vector is the amplitude density distribution of an EM wave. The amplitude density distribution is calculated...
It is well known that electromagnetic (EM) waves are radiated from the Earth surface as precursor phenomena due to Earth-crustal movements such as earthquakes. Issues on anomalous signal detection and observation systems are widely investigated by researchers. Recent several researches in our study are reviewed in this paper.
Anomalous environmental electromagnetic (EM) radiation waves have been reported as the portents of earthquakes. We have been measuring the extremely low frequency (ELF) range all over Japan. Our goal is to predict earthquakes using EM radiation waves. Previously, we proposed a method of detecting anomalous signals by focusing on linear prediction errors. However, this method also sensitively responds...
Anomalous radiation of environmental electromagnetic waves is reported as a portent of earthquakes. Then, we are observing environmental electromagnetic waves of the ELF range all over Japan. We have been regarding the high amplitude in the observed signal as anomalous radiation. However, the observed signal contains a lot of low amplitude anomalies hidden by background noise. These anomalies also...
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