地震台站地电场异常特性:以中国航空工业总公司625研究所为例  

Precursory Abnormal Characteristics of Geoelectric Field:A Case Study of Seismostation in 625 Research Institute of Aviation Industry Corporation of China

作　　者：杜秋姣[1,2,3] 李阶法[4] 李献瑞 曾佐勋[1,3] 

机构地区：[1]中国地质大学地球科学学院,湖北武汉430074 [2]中国地质大学数学与物理学院,湖北武汉430074 [3]中国地质大学教育部长江三峡库区地质灾害研究中心,湖北武汉430074 [4]中国航空工业总公司625研究所,北京100000

出　　处：《地球科学（中国地质大学学报）》2014年第12期1851-1856,共6页Earth Science-Journal of China University of Geosciences

基　　金：国家"985"创新平台建设项目;国家青年科学基金项目(No.41404041);中国博士后科学基金(No.2014M562079)

摘　　要：通过分析中国航空工业总公司625研究所地电场监测站30多年监测的原始资料,提取了其中8组数据,包括4组地电场中的长期异常信号和4组对应震级Ms6.0以上的地震震前短临异常信号.发现这些异常信号有以下特征:地电场中的长期监测图中包括了许多不同大小、距离远近地震的孕震信息,其中近区大震会主控一条或多条曲线的走势,远大、近小的地震会造成曲线时上时下的振荡;从4组地电场短临信号监测图中发现震前地电场异常总体表现为下降(上升)—折返—回跳—发震的模式,说明地电场异常变化形态具有相似性和重复性,证明地电场观测确实能监测到震前异常.发现适合该监测站预测发震时间的新方法:根据折返天数与回跳天数大致相等,即回跳日期加上折返天数为发震日期,证明地电场短临预测方法具有一定的实用性.The geoelectric field data recorded for more than thirty years at seismostation in 625 Research Institute of Aviation Industry Corporation of China were analyzed,and eight sets of data including four sets of long-term abnormal signals and four sets of short-term abnormal signals were extracted.The abnormal short-term signals correspond to four M s 〈6.0 earthquakes. The geoelectric field signals have the following characteristics.（1）The long-term geoelectric field curves include precursory in-formation from many earthquakes with different magnitudes and epicenter distances.The near-field and major earthquakes con-trol the trendy of geoelectric field curves.Meanwhile big far earthquakes and small near earthquakes can cause oscillations up and down.（2）In the four short-term signals,we find that the geoelectric field curves show a common pattern of up（down）, return,bound and occuring phases.The geoelectric field abnormal forms have similarity and repeatability.This proves that the geoelectric field observation can monitor the impending earthquake precursor.A new method to predict the occurrence-time is found.Based on the number of return days approximately be equal to the number of bound days,the date of occurrence time is the date of return plus the number of bound days.It pushes further the method of geoelectric field short-term earthquake pre-cursor toward practice.

关 键 词：地电场 异常特征 短临前兆 天然地震 

分 类 号：P319[天文地球—固体地球物理学]