OBSERVATION AND EXPERIMENT ON SEISMO-ELECTROMAGNETIC WAVES IN CHINA

概要

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Two observatoies were built up in Beijing Baijiatan and Longfang of Hebei Province to record the Seismo-Electromagnetic waves (SEM) before earthquakes on 1985. The waves received can be divided into five ranges according to their frequency bands : 0.1-20Hz; 15KHz; 1.65MHz; 0.5-5KHz; 120-160KHz. By many years' observation it has been found that unusual radio emission was sometimes recorded in most stations within the epicentral distance of 200Km one to ten days before an earthquake of magnetude greater than 4.0. We have collected the data concerning the whole process for the earthquakes of magnitude 6.1 on 18th of October 1989 in Daton, Shanxi province. We have taken part in the experiment on fractures of rocks in the field to study the mechanism of producing SEM pulses on the impending stage before an earthquake and to clarify whether the SEM emission can be generated during the fractures in rocks.
独立行政法人防災科学技術研究所の論文
1993-03-29