地电场方法在川滇地区地震观测中的应用  

Application of telluric electric field on seismic observation in the Sichuan-Yunnan region

作　　者：张小涛 马新欣[2] 刘晓灿[2] 姚丽[2] 袁亚红[2] 

机构地区：[1]邯郸地震中心台,中国河北056001 [2]中国地震局地球物理研究所,中国北京100086

出　　处：《地震地磁观测与研究》2010年第6期93-98,共6页Seismological and Geomagnetic Observation and Research

基　　金：中央级公益性科研院所基本科研业务专项"华北地区电磁场动态演化特征研究"项目资助

摘　　要：利用云南省(5个)和四川省(4个)"十五"期间布设的地电场观测数据,利用大地电场观测系统中,同一测向长短极距测值的比值方法进行分析,发现能够较好地排除来自大地电场及自然电场远场的变化信息,突出可识别的地震前兆异常信息。研究结果表明:在剔除各种环境和空间电流体系的影响因素后,提取了与地震有关的异常信息,在川滇地区5.0级地震前,多数台站的地电场观测资料比值发生异常变化,异常大多出现在地震前0.5—3个月,其中汶川地震和姚安地震前,研究区的9个台站均出现异常。Using the ratio method of long and short spacing the measured value in same telluric elec- tric field, the tellurie electric field observation data in total 9 stations in Yunnan and Sichuan provinces during 2006 to 2010 are analyzed. It is found that the method can exclude the variety information from the telluric electric filed and natural electric field, highlighting the seismic anomaly with identifiable information. The results show that. excluding various environmental and spatial factors influence the current system, the anomaly information on earth-quakes is extracted. Before the M 5.0 earthquakes in the Sichuan-Yunnan region, most stations, the ratio of electric field observations changes abnormally in most of stations. The anomalies occur usually 0. 5 3 months before the earthquakes. Before Yao＇an and Wenchuan earthquakes, anomalies appeared in all of 9 stations in the study area.

关 键 词：地电场 长短极距比值 异常提取 川滇地区 

分 类 号：P315.722[天文地球—地震学]