西秦岭北缘断裂带新活动特征

RECENT ACTIVITY CHARACTERISTIS OF THE FAULT ZONE AT NORTHERN NEDGE OF WESTERN QINLING MT

摘要:

在本文中,作者在近几年进行的大比例尺活断层地质填图工作的基础上,介绍了西秦岭北缘断裂带晚第四纪以来活动的基本待征,研究了该断裂带的空间展布情况、几何学和运动学特征、断层活动速率、古地震与地震重复周期等。结果表明,该断裂带自第四纪以来由压性逐渐演变为左旋扭动,其水平滑动速率为2.1-2.8mm/年,垂直滑动速率为0.4-0.7mm/年,地震复发周期约为5000年。

Abstract:

In this paper, based on the filling active faults in geologic map with large scale in recent years,the authors present the basic activity characteristics of the fault zone at northern edge of western Qinling Mt. since late Quaternary period, and study the spatial distribution, geometry and kinematics characteristics, slip rate of fault,paleoearthquake and seismic recurrence period. The results show that the active way of the fault zone changes from compression to left-later-al slip since Quaternary period, with a horizontal slip rate 2.1-2.8mm/ year and a vertical slip rate of 0.4-0.7mm/year. The recurrence period of earthquake is about 5000 years in the fault zone.