摘要
本文利用1978～1985年菏泽地震巢内发生的地震,分析研究了1983年11月7日菏泽5.9级地震前后的地震波特性。发现在菏泽5.9级地震前出现26个月的波速比和振幅比低值异常,两者同步变化,震后恢复正常。这种现象,为观测地震波特性的前兆异常给予了启示。
In this paper, the seismic wave characteristics before and after the Nov. 7 , 1983 Heze earthquake (M5.9) have been analysed by using events occurred in the Hcze seismogenic area during 1978-1985. The anomalous low values of wave velocity ratio and amplitude ratio in 26 months betore the earthquake have been found out, which varied synchronously and recovered to the normal stage afterward. Such a phenomenon has enlightened us on the precursory anomaly of the observed wave characteristics.
出处
《地震研究》
CSCD
北大核心
1989年第3期228-233,共6页
Journal of Seismological Research
关键词
地震波
地震前兆
异常
地震
Seismic wave, Wave velocity ratio, Amplitude ratio, Precursory anomaly
