一、引言活动速率是评价断裂活动强度的一个重要标志,也是确定断裂平均大震重复间隔必不可少的基本参数.因此,活动速率是活断层研究中的一个重要方面.笔者近年进行了大青山山前断裂1:5万地质填图工作,对该断裂晚第四纪活动速率作了专题研究. I. INTRODUCTION The activity rate is an important indicator to evaluate the intensity of the fault activity and is also an essential parameter for determining the mean interval between faults. It is therefore one of the most important aspects in the study of active faults.In recent years, Piedmont fault 1: 50000 geological mapping work, the late Quaternary tectonic activity rate made a special study.