定西地电台地电阻率观测数据分析  

Analysis of earth resistivity observation data at Dingxi Ground-Resistivity Station

作　　者：陈彦平 闫万生 叶媛媛 王军燕 CHEN Yanping;YAN Wansheng;YE Yuanyuan;WANG Junyan(Longnan Seismic Monitoring Center Station,Gansu Province 746000,China;Lanzhou Seismic Observation Center Station,Gansu Province 730000,China)

机构地区：[1]陇南地震监测中心站,中国甘肃746000 [2]兰州地震观测中心站,中国甘肃730000

出　　处：《地震地磁观测与研究》2022年第5期64-70,共7页Seismological and Geomagnetic Observation and Research

基　　金：甘肃兰州地球物理国家野外科学观测研究站项目(课题号:ZX2117008)。

摘　　要：受环境干扰影响,定西地电台于2014年迁址重建,新场地干扰小,观测系统稳定,产品数据连续可靠。选取2015—2021年该台地电阻率观测数据进行分析,可知:①NS、EW测道具有明显的夏高冬低型年变形态;②破年变低值异常:2017年,NS测道出现破年变异常、EW测道同时段出现测值波动,持续3个月后发生九寨沟M_(S) 7.0地震(震中距260 km);2021年6—9月,NS、EW测道同步出现破年变异常,持续6个月后发生门源M_(S) 6.9地震;③每年6—9月,受测区农田灌溉及降雨影响,NS、EW测道地电阻率测值波动明显。Affected by environmental interference,the Dingxi Ground-Resistivity Station was relocated and rebuilt in 2014.The new site has little interference,a stable observation system,and continuous and reliable product data.Selecting the observation data of resistivity at this station from 2015 to 2021 for analysis,it can be seen that:①The NS and EW measurement components have obvious annual variation patterns of high values in summer and low values in winter.②The NS component observation shows the anomaly of breaking annual variation in 2017;at the same time,the EW component observation shows fluctuations.3 months later,the Jiuzhaigou M_(S) 7.0 earthquake(with an epicentral distance of 260 km)occurred;from June to September 2021,the NS and EW components synchronously showed the anomaly of breaking annual variation.The Menyuan M_(S) 6.9 earthquake occurred 6 months later.③From June to September every year,due to the influence of farmland irrigation and rainfall in the measurement area,the resistivity observations of the NS and EW components fluctuated significantly.

关 键 词：地电阻率 年变形态 破年变 

分 类 号：P315.722[天文地球—地震学]