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四川木里小震群活动特征研究
蔡一川 戴仕贵 魏娅玲
(四川省地震局,成都 610041)
摘要:
本文通过对四川木里地区地震震源位置的重新确定,反演了较大地震震源机制解,结果显示:①重定位后的小震群震中分布成带状,地震震源深度分布在0—12km范围内;②经过对震群空间分布进行仔细分析,认为其发震构造是小金河断裂西侧的一条NWW向分支断裂;③3次4.0级以上地震震源参数存在明显差异,浅源逆冲事件表现有受垂直方向应力(重力)作用的特征,走滑事件表现出与区域应力构造活动有关。
关键词:  震群活动  地震条带  双差定位方法  震源机制
DOI:
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基金项目:
Research on the Activity Characteristics of Small Earthquake Swarms in the Muli Area of Sichuan Province
Cai Yichuan,Dai Shigui,and Wei Yaling
Earthquake Administration of Sichuan Province,Chengdu 610041,China
Abstract:
In this article,we relocated the seismic source location of the earthquakes in the Muli area of Sichuan,inverted the focal mechanism of the larger earthquakes and analyzed the relationship between the water level of the Jinping reservoir and the frequency of the earthquake swarm. The results show that: ( 1 ) The epicenters of the relocated small earthquake swarms are distributed in a seismic zone,and the earthquake focal depths were in the range of 0 -12km. (2) By analyzing the earthquake swarm spatial distribution,we found that the swarms were generated by one branch fault on the west of Xiaojinhe fault. (3) The focal mechanism of the three earthquakes with magnitude greater than 4. 0 is significantly different,with the shallow source thrust events affected by vertical stress,and the strike-slip events are related to regional stress tectonic activity.
Key words:  Earthquake swarm activities  Seismic zone  Double  difference location method  Focal mechanism