关键词: 活断层, 综合判断, 分段准则, 安全性评价

Abstract: Fault segmentation has been playing an important role in seismic safety assessment of major engineering. There are,however,many problems either in the methods of fault segmentation themselves or in the applications to the engineering practice. This paper uses results of segmentation along three faults that have been regarded internationally as the most reliable fault segmentation to analyse the segmentation methods,segmentation features,and their uncertainties. The purpose is to establish several criteria for fault segmentation that can be used in seismic safety assessment. Following criteria are proposed: (1) Sufficient and concrete evidence is necessary for fault segmentation; (2) Uncertainties associated with fault segmentation require comprehensive segmentation features. It seems that more than three methods and more than four features may reliably delineate a fault segment; (3) In order to increase reliability of fault segmentation,reliable features should be used as much as possible; (4) It is important to pay attention to persistency of fault segmentation boundaries.

Key words: Active fault, Synthetical judgement, Criteria of segmentation, Safety assessment