摘要
本文从断裂的沉积、地貌和变形特征方面研究了昌马断裂的运动方式。结果表明,昌马断裂是一条枢纽断裂,枢纽轴位于断裂中段。提出了昌马断裂的力学模式,认为昌马地震是在北东～南西向水平挤压应力产生的左旋剪切应力和垂直断裂面的正压力联合作用下,昌马断裂枢纽轴部的介质强化。
This paper has studied the movement pattern of Changma fault in the light of the characteristics of sedimentation of geomorphology and deformation with relation to fault. The results show that Changma fault is a hinge fault and its hinge axis lies at the central segment of the fault. The mechanical model of the fault has been put forward in the paper. And it is believed that Changma fault results from the medium hardening and ,stress concentration at the hinge axis of the fault under the combined action of left-lateral shear stress caused by NE-SW horizontal compressive stress and normal pressure perpendicular to the fault plant.
出处
《地震研究》
CSCD
北大核心
1989年第1期29-36,共8页
Journal of Seismological Research
