曲江断裂断面结构及地震地质意义

THE FAULT PLANE STRUCTURE OF THE QUJIANG FAULT AND ITS SEISMOGEOLOGICAL IMPLICATION

本文在野外地质调查的基础上，从曲江断裂两盘的地层分布、产状变化、破碎带宽度的异常分布等方面对曲江断裂的断面结构进行了初步分析，认为曲江断裂上存在两个尺度较大的凹凸体。结合该断裂的右旋运动特点，对曲江断裂破碎带异常展宽段及串珠状小盆地的成因给予了解释，同时认为曲江断裂上三次７级以上强震的震中与凹凸体的位置明显相关。

In this paper, based on field geological investigation, a preliminary analysis of the fault plane structure of the Qujiang fault is made in aspects, such as stratigraphic distribution, occurrence variation and anomalous distribution of fracture zone width in the two walls of the Qujiang fault. It is believed that there are two large scale depression- protrusion bodies in the Qujiang fault. In combination with rightlateral movement features of the fault, the authors give interpretation of causes of anomalously widened segments in the fracture zone of the Qujiang fault and some small basins appeared in a string of beads and think the epicenters of three strong earthquakes with more than Ms 7 are correlated obviously to the locations of the depression-protrusion bodies.