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一、前言 大震之前有地声,这为中外无数次的记载所证实。地声研究工作的主要问题,是探索主震与声发射在时间和空间上是否相关。要回答这个问题,必须积累大量、连续的观测资料。
I. Preface The earthquakes are heard before the earthquake, which is confirmed by countless records at home and abroad. The main problem of the study of ground acoustics is to explore whether the main shock and acoustic emission are related in time and space. To answer this question, we must accumulate a large number of continuous observation data.