摘要
本文通过对双震型地震序列的地震波动力学特征的研究，提出了识别双震中第二主震前震的可能性。结果表明、在双震第一主震发生后，序列地震的Ｐ波垂直分量初动一致时，可依据波形来识别第二主震的前震；而初动不一致时有三种情况：１、两组初动中有一组Ｐ、Ｓ波振幅比仍保持为过原点的直线而另一组离散，２、两组初动的振幅比分别为过原点的直线；３、两组初动的振幅比共同组成过原点的直线，对前两种情况可识别第二主震的前震，最后一种情况难以识别。总体达６０－７０％的可识别率。
Through feature studies of earthquake wave dynamic of double-eventsequence, the possibility to distinguish foreshocks of second main shock hasbeen proposed in this paper. The results are divided into two groups thatone has same directions with P wave onsets, another has different directions.The former can be used to distinguish foreshocks of second main shock bywave form. The latter has three subgroups: 1. the amplitude ratios of Pand S waves are straight lines through origin or discrete; 2. the amplituderatios are straight lines through origin respectively; 3. straight lines throughorigin commonly. It is possible to distinguish foreshocks from the first andsecond subgroups, difficult from the third. The distinguishable rate is 60-70%.
出处
《地震研究》
CSCD
北大核心
1995年第2期117-124,共8页
Journal of Seismological Research
基金
国家地震局"八五"重点项目
关键词
双震型地震
地震序列
前震
振幅比
地震波
Double earthquake type
Seismic sequence
Foreshock
P wave first motion
Amplitude ratio
Yunnan
