2018年松原M5.7地震前地电阻率变化特征研究  

Anomaly Analysis of Geoelectrical Resistivity Observations Before 2018 Songyuan M5.7 Earthquake

作　　者：高研 李飞 史红军[3] GAO Yan;LI Fei;SHI Hong-jun(Suihua Seismic Station ,Heilongjiang Suihua 152000,China;Xinyi Seismic Station ,Jiangsu Xinyi 221400,China;Yushu Seismic Station ,Jilin Yushu 130400,China)

机构地区：[1]绥化地震台,黑龙江绥化152000 [2]新沂地震台,江苏新沂221400 [3]榆树地震台,吉林榆树130400

出　　处：《防灾减灾学报》2019年第2期46-51,共6页Journal of Disaster Prevention And Reduction

摘　　要：采用年变、归一化速率法和各向异性度提取和分析了松原M5.7地震前四平台、榆树台、绥化台地电阻率资料异常,结果表明:(1)震前地电阻率1~2年左右时间出现中期异常,归一化速率法还出现一定的短临异常,但未有临震异常出现;(2)归一化速率法和各向异性度都是在出现正异常之后发震;(3)三种分析方法的异常形态、幅度各不相同,反映出三台资料存在明显的各向异性。这与各台的地质构造、裂隙走向、主压应力方向、发震构造与破裂方向、台站与震中的相对位置等具有关联性。The anomalous changes of geoelectrical resistivity before Songyuan M5.7 earthquake are observed at Siping,Yushu and Suihua Seismic Station by annual variation,normalized variation rates method and anisotropy degree. The resules show that:(1) 1-2 years medium-term anomalies of geoelectrical resistivity would appeare before earthquake occured. There were some short-term and imminent anomalies of normalized variation rates method. However,there was no imminent anomalies;(2) An earthquake followedbypositive anomaly of normalized variation rates method and anisotropy degree;(3) The abnormal forms and rangea of the three analysis methods are different,reflecting the obvious anisotropy of the three station. It was related to the geological structure of each station,fracture direction,main pressure stress direction, seismogenic structure and rupture direction, the relative position of the station with the epicenter,et al.

关 键 词：地电阻率 前兆异常 年变 速率法 各向异性 

分 类 号：P315.72[天文地球—地震学]