1976年盐源—宁蒗地震序列的破裂特征

FRACTURE FEATURE OF 1976 YANYUAN-NINGLANG EARTHQUAKE SEQUENCE

使用地震活动图象和震源机制资料的构造分析方法,研究盐源—宁蒗地震序列的破裂特征。结果认为:6.7级地震破裂面是北北东向左旋走滑断层,5.6和6.4级地震破裂面是两条北西西向右旋走滑断层,构成以北北东向断层为主干的共轭破裂组合。该序列受弥渡—木里地壳深部活动断裂带控制。

The fracture feature of the Yanyuan-Ninglang earthquake sequence was studied using by tectonic analysis based on the data of seismicity pattern and focal mechanisms. The strike of the faulting plane of the M6.7 event is NNE with left lateral strike slipping, and that of both the M5.6 and M6.4 events are NWW with right lateral strike slipping, forming a combination of the conjugate fractures, of which the dominant is NNE faulting. This sequence was controlled by the Midu-Muli deep-seated fault zone.