| 云南地区双震型地震序列中第二主震的前震识别 |
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| 引用本文： | 蔡静观,雷素华.云南地区双震型地震序列中第二主震的前震识别[J].地震研究,1995,18(2):117-124. |
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| 作者姓名： | 蔡静观 雷素华 |
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| 作者单位： | 云南省地震局 |
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| 基金项目： | 国家地震局“八五”重点项目 |
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| 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。
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| 关 键 词： | 双震型地震 地震序列 前震 振幅比 地震波 |
FORESHOCK IDENIFICATION OF SECOND MAIN-EARTHQUAKE IN DOUBLE-EVENT SEQUENCES IN YUNNAN REGION |
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| Cai Jingguan, Lei Suhua, Wang Xinghui, Zhang Xiling.FORESHOCK IDENIFICATION OF SECOND MAIN-EARTHQUAKE IN DOUBLE-EVENT SEQUENCES IN YUNNAN REGION[J].Journal of Seismological Research,1995,18(2):117-124. |
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| Authors: | Cai Jingguan Lei Suhua Wang Xinghui Zhang Xiling |
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| Abstract: | 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%. |
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| Keywords: | Double earthquake type Seismic sequence Foreshock P wave first motion Amplitude ratio Yunnan |
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