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序 探索大地震前区域地震纵横波速度比(V_P/V_S)的异常变化,是地震预报研究的一个重要课题。尤其自60年代以来,国内外都开展了这方面的观测和探讨,获得了一批成果,并成为某些前兆理论的主要依据之一。冯德益编著(1981)的《地震波速异常》就此作了系统的阐述和讨论。
It is an important issue for seismic prediction research to explore the anomalous change of the V / V-V ratio of regional seismic waves before a large earthquake. Especially since the 1960s, some observations and discussions have been carried out at home and abroad, which have yielded a number of achievements and become one of the main bases for some precursory theories. The “seismic anomalies” edited by Feng Deyi (1981) have been systematically elaborated and discussed.