中强震前新沂台电阻率各向异性值(S)变化特征  

VARIATIONAL CHARACTERISTICS OF GEOELECTRICAL RESISTIVITY ANISOTROPY VALUE (S) BEFORE MODERATE-STRONG EARTHQUAKE IN XINYI SEISMIC STATION

作　　者：李飞 夏忠 杨冯威 

机构地区：[1]江苏省新沂地震台,江苏新沂221400

出　　处：《东北地震研究》2008年第1期22-27,共6页Seismological Research of Northeast China

摘　　要：对新沂地电阻率观测资料进行处理的基础上,研究了地震地电阻率各向异性的前兆异常特征,结果表明:1.在中强震前,震区一定范围内的地电阻率各向异性值(S)会出现上升型异常变化,这种变化表现为在原有平稳变化的背景上的上升变化或者是在原有上升趋势背景上的加速上升变化、亦或是在原有下降趋势背景上的上升变化;2.台站周围400 km内5级以上地震发生前均存在明显的地电阻率各向异性值(S)前兆异常。On the basis of the processed observational data of the geoelectrical resistivity from Xinyi seismic station, the characteristics of the precursory anomaly of the anomalous characteristics of the geoelectrical resistivity anisotropy value （S） are studied. The results show： 1.S value of the geoelectrical resistivity can appear the rising change within a certain scope of the seismic area before the moderat-strong earthquake, this kind of change can be a rising change on the original stable background, or an accelerative rising change on the original rising background, or a rising change on the original descending trend background; 2.There is clear S value anomaly before the earthquake （Ms≥5） within 400 km around the station.

关 键 词：新沂地震台 前兆异常 各向异性值(S) 电阻率 

分 类 号：P315.7[天文地球—地震学]