自动识别多期断层擦痕的一种应力反演算法  

A Stress Inversion Procedure for Automatic Recognition of Polyphase Fault/Slip Data Sets

作　　者：单业华[1] 李志安[2] 林舸[2] 

机构地区：[1]青岛海洋大学海洋地质系,山东青岛266003 [2]中国科学院长沙大地构造研究所,湖南长沙410013

出　　处：《地球学报》2003年第2期181-186,共6页Acta Geoscientica Sinica

基　　金：中国科学院资源环境领域知识创新工程重要方向项目 (KZCX2 113);山东省自然科学基金 (Y98E0 80 78)

摘　　要：由于地质历史上构造应力场的演变 ,多期断层擦痕数据的存在是应力反演所面临的普遍性问题。以往提出处理多期断层擦痕的应力反演算法都基于硬划分 ,忽视了数据自身的不确定性 ,并且一些只是传统的、处理一期断层擦痕的算法的简单延拓。在Fry (1999)的sigma空间里 ,同期断层擦痕向量具有统一的线性分布趋势 ,多期断层擦痕向量具有不同的线性分布趋势。在此基础上 ,本文提出利用模糊线性聚类法来识别多期断层擦痕向量的线性结构。这种算法不仅可以弥补以往算法的上述缺陷 ,还具有自动、直接、有效 。The presence of polyphase fault/slip data caused by the variability of tectonic stress fields in the geological history is a ge neral problem in stress inversion. Algorithms previously presented for separation of polyphase fault/slip data sets are based on hard subdivision and underestimate the intrinsic nondeterminacy of data. In some of these algorithms, the classic algorithm for one phase fault/slip data is embedded. In Fry's (1999) sigma space, the vectors of one phase fault/slip data must have a linear tendency whe reas the vectors of polyphase data have multiple linear tendencies. The authors herein apply modern fuzzy clustering analysis to detec ting the linear structures of fault/slip data. The algorithm used here considers the nondeterminacy of data and hence can overcome the shortcomings of existing algorithms. It is automatic, direct and effective,and needs less running time.

关 键 词：多期断层擦痕 模糊聚类 构造应力场 古应力 线性分布趋势 断层活动 

分 类 号：P55[天文地球—构造地质学] P542.3[天文地球—地质学]