摘要
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。
In order to expand the application of the method of correlation coefficient of spectral amplitude, we calcu- lated the correlation coefficient of spectral amplitude of aftershock sequence of Jinggu Ms6. 6 earthquake in 2014 and Cangyuan Ms5.5 earthquake in 2015. The results show that the correlation coefficient of spectral amplitude maintained the high value after Jinggu earthquake, and the Ms5.8 and Ms5.9 strong aftershocks occurred in two months after the main shoclc This high value implied the consistency of focal mechanism and the stronger region- al stress, which was beneficial to occur the strong aftershock and the regional middle-strong earthquake cluste- ring. The correlation coefficient of spectral amplitude of the aftershock sequence of Cangyuan earthquake was high, which was similar to that of Jinggu earthquake. The historical earthquake sequence which occurred in the area of the epicenters of Jinggu and Cangyuan earthquakes were mainly shock-aftershock type. It was hard to pre- dict the magnitude of the earthquake after main shock by the absolute value of correlation coefficient of spectral amplitude. But the high values of the two earthquake sequence may show that it was in the state of the higher value of stress and existed the background of occurring the middle-strong earthquake in the southern region of Yunnan.
出处
《地震研究》
CSCD
北大核心
2015年第4期535-540,697,共6页
Journal of Seismological Research
基金
中国地震局地震预测研究所基本科研业务费专项(2012IES0201)
中国地震局监测预报司震情跟踪青年课题(2015010126)联合资助
关键词
景谷地震
沧源地震
谱振幅相关系数
震源机制一致性
余震序列
Jinggu Ms5.8 earthquake
Cangyuan Ms5.9 earthquake
correlation coefficient of spectral amplitude
the consistency of focal mechanism
aftershock sequence
