Abstract: Fault motion has complicate and variable pattern and a segment of a giant fault zone is usually an unit of jupture.Individual fault segment has its own feature,such as segment length and displacement amount produced during faulting,and position of the actual segment of the fault often changes regularly with time.In order to meet the needs for major engineering projects and strong earthquake prediction,it is necessary to determine which segment of fault zone is active.We propose in this paper that recent activity along a fault zone can be directly identified based on activity sequence of the strong earthquake and multiplesurvey on the geodetic network across the fault zone,and then the active segment can be determined in combination with geomorphic feature and variation of ground water level.

Key words: Active fault, Segmentation of fault movement, Sequence of strong earthquake, Geodetic survey across a fault, Non-synchronous activity

摘要： 断层运动是复杂而多变的,在一条巨大的断裂带上经常以区段为单位活动,每次活动的区段长度、运动量等都不相同,且往往具有一定的迁移规律等。为工程建设和强震的预测,划分活断层运动区段越来越迫切。以一次强震活动序列、跨断层大地测量网的复测、直接鉴定断层新活动、并结合地形地貌和地下水位变化等途径来划分断层运动的区段。

关键词: 活断层, 运动区段, 强霞活动序列, 跨断层大地测量, 活动时间不同步