A simple signal detection method for great earthquake prediction by observation of seismic electromagnetic wave radiations

A new signal processing method for detecting electromagnetic radiation due to the earthquake activities are presented. The radiation is usually contaminated by background noises. In this paper, a simple method which deals with difference data between the latest data and averaged data. over past several years are proposed. The good performance was obtained to detect a precursor signal of an earthquake by utilizing the proposed method.

1. Introduction

Recently, a lot of methodologies have been investigated to find a provability of prediction for earthquake. [1]–[3], [6]–[8]. Eelectromagnetic wave due to seismic activities can be radiated as an indication of an earthquake. The radiation is considered to originate in electro-mechanical process associated with the tectonic movements, and in electrochemical reactions such as the oxidization of reactive materials in the earth crust, which are ascending from deep under the ground with the magma, although the detail of the mechanism has not been understood. A possibility is given by detecting the radiation to predict an occurrence of an earthquake and to avoid the disastrous situation. We have already developed over forty observation stations measuring the atmospheric electromagnetic radiation of 223 Hz frequency in extremely low frequency (ELF) band [2], [3].