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作为谱振幅相关分析法的拓展应用,计算了2014年10月7日云南景谷MS6.6地震、2015年3月1日云南沧源MS5.5地震余震序列的谱振幅相关系数。结果显示,景谷地震后谱振幅相关系数维持在高值,主震后2个月,发生了MS5.8、5.9强余震。该高值体现出震源机制具有较高的一致性和较强的区域应力水平,有利于强余震的发生和区域中强地震丛集。沧源余震序列谱振幅相关系数的结果与景谷地震相似,一直处于高值。景谷地震与沧源地震所在地区历史地震序列以主—余型为主,不能简单地利用谱振幅相关系数的绝对值预测后续地震的大小,但两个序列的高值也许显示滇南较大区域目前正处于强应力状态下,存在发生中强地震的背景。
As an extension of spectral amplitude correlation analysis, the spectral amplitude correlation coefficients of the MS6.6 earthquake in Yunnan Valley on October 7, 2014 and the aftershock sequence of the MS5.5 earthquake in Cangyuan, Yunnan on March 1, 2015 were calculated. The results show that after Jinggu earthquake, the correlation coefficient of spectral amplitude remains at a high value. Two months after the main shock, MS5.8 and 5.9 strong aftershocks occur. This high value shows that the focal mechanism has high consistency and strong regional stress level, which is good for the occurrence of strong aftershocks and strong earthquakes in the region. Cangyuan aftershock sequence spectral amplitude correlation coefficient results and Jinggu earthquake similar, has been at a high value. The historical earthquakes in Jinggu earthquake and Cangyuan earthquake are dominated by mainly residual ones, and the magnitude of subsequent earthquakes can not be predicted simply by using the absolute values of spectral amplitude correlation coefficients. However, the high values of the two sequences may indicate that the larger area in southern Yunnan At present, under the condition of strong stress, there is a background of moderate-strong earthquakes.