跨断层形变的慢时变结构分析与异常识别初探

将自适应控制理论引入跨断层流动形变分析。利用甘肃及与宁夏、青海交界的监测区内石灰窑口、红柳峡、窝子滩、扁都口、南营5个场地典型观测曲线,构建慢时变前兆系统结构,研究其与6级左右及6级以上地震孕育-发生过程的可能关系。可显示震前中短期阶段最大特征根模1.0以上异常,异常识别较原始观测曲线分析减少了人为性与经验性,也反映出断层形变前兆系统结构的动态变化和自适应性。

Identification of Abnormity and Analysis of Slow Time-Varying Structure for Cross-fault Deformation

Using 5 typical observational curve at sites such as Shihuiyaokou,Hongliuxia,Wozitan,Biandukou and Nanying,in the monitoring area of Gansu Province and its boundaries with Ningxia and Qinghai Provinces,the slow time-varying precursor system is constructed,the abnormity is identified,and the possible relationship between the abnormity and preparation of earthquakes around or over 6.0 magnitude are researched.The results show that at the medium and short-term phase before these earthquakes,the maximum module of latent root exceeded 1.0.This method reduced factitious or experiential identification of abnormity relative to analysis of observational curve,also reflects dynamic variation and adaptive features of precursor system structure for cross-fault deformation.