摘要
本文比较了2017年九寨沟地震、1976年松潘震群和1973年松潘黄龙地震的序列特征。九寨沟序列的空间演化特征与松潘震群序列存在一定差异。M-t图显示,九寨沟地震序列衰减迅速,余震活动水平较低,松潘震群第一次主震后的余震存在强度升级现象,随后发生了第二、三次主震。九寨沟序列和松潘黄龙序列余震的等待时间与发生时间符合双对数线性关系,为主余型序列。松潘震群序列的等待时间计算结果则不符合上述特征,直到最后一个主震发生后,余震的等待时间与发生时间转而表现出很好的双对数线性关系。
The 2017 Jiuzhaigou earthquake sequence,the 1976 Songpan earthquake swarm and the 1973 Songpan earthquake are compared with each other.Spatial evolutions of aftershocks are different between the Jiuzhaigou earthquake and the Songpan earthquake swarm.M-t graphs are also different.The Jiuzhaigou sequence decays very fast and has a low level activity of aftershocks.After the first mainshock of the Songpan earthquake maximum magnitude of aftershocks increases gradually.Soon after that,the second mainshock and the last mainshock occur.There si a linear relationship between logarithm of the waiting-time of aftershocks and logarithm of the occurrence-time for the Jiuzhaigou sequence and the 1973 Songpan sequence.That accords with of mainshock-aftershock type sequence.The‘waiting time’graph for the 1976 Songpan earthquake much different from that characteristic.But after the last mainshock occurs,logarithm of the waiting-time of the occurrence-time has a good linear relationship.
作者
姜祥华
臧阳
孟令媛
周龙泉
JIANG Xianghua;ZANG Yang;MENG Lingyuan;ZHOU Longquan(China Earthquake Network Center,Beijing 100045,China)
出处
《四川地震》
2018年第1期1-4,共4页
Earthquake Research in Sichuan
基金
国家自然科学基金(41504047)
中国地震局监测预报司震情跟踪工作任务(2017010106
2017020103)联合资助
