程海断裂带断层泥中石英碎砾表面SEM特征及断层活动状态的分析

根据断层泥中石英碎砾表面SEM特征的鉴定研究，可将程海断裂中、北段断层泥中石英碎砾表面SEM形貌特征分为6类，这表明该段断裂经历了长期多期次活动，强烈活动时间在中晚更新世；5件样品中均未见破裂类(Io)的石英颗粒，表明程海断裂全新世以来强烈活动的频度相对较低。石英碎砾表面机械作用特征的分类统计研究显示：程海断裂中、北段晚更新世以来，断层所经历的活动方式以粘滑活动为主。

The SEM Characteristics of the Surface of Quartz Grains in the Gouge of Chenghai Fault and Evaluation of Its Activity

According to the study and identification of the SEM characteristics of quartz grains in the gouge of the Chenghai fault, we can sort the SME characteristics of the quart grains in the gouge of middle and northern segment of Chenghai fault into six categories except the type (I0) of cracked-structure quartz grain. This phenomenon indicates that the fault's activity has taken place for many times in a long period and the strong activities were in the middle Pleistocene and Epipleistocene respectively. Since Holocene, the frequency of strong activity of the fault has been low. The study on the statistics of mechanical effect on the surface of quartz grains indicates that since Epipleistocene, the strick-slip has predominated the activity of the middle and northern segment of the fault.