摘要
本文利用菏泽、嘉祥和梁山地震台1979—1985年记录菏泽地震巢内的地震资料,分别计算了三分向和垂直向的地震尾波衰减系数K值,分忻了菏泽5.9级地震前后地震尾波的衰减变化。计算结果,菏泽、嘉祥和梁山台的三分向和垂直向的尾波衰减系数,在5.9级地震前均出现了明显的低值异常。异常时间21个月,最低值的下降幅度达50％左右。地震后尾波衰减系数K值恢复正常。
Based on the seismic data of Heze, Jariang and Liangshan stations from 1979 to 1985, where the earthquakes occurred in Heze could be recorded, the attenuation coeffcient K for the seismic coda wave of three components aud vertical component has been computed and their variations before and after Heze Ms5.9 earthquake have been analysed. The results have shown that the coda wave atten-uation coefficient of the three components and the vertical component at these stations obviously displyed anomalous low value before the event. The anomaly duration reaches to 21 months. The minimum decreases nearly by 50％, The attenuation coefficient returned to the normal value after the event.
出处
《华北地震科学》
北大核心
1990年第4期47-55,共9页
North China Earthquake Sciences
