周至地电阻率观测环境干扰数值模拟  

Numerical simulation of the environmental interference on georesitivity observation at Zhouzhi Seismic Station

作　　者：石富强[1] 张国强[1] 方炜[1] 邵辉成[1] 邱玉荣[1] 

机构地区：[1]陕西省地震局,中国西安710068

出　　处：《地震地磁观测与研究》2014年第5期230-236,共7页Seismological and Geomagnetic Observation and Research

基　　金：陕西省地震局青年科研基金课题(201203);陕西省地震局启航与创新基金课题(201304);中国地震局监测预报司震情跟踪青年课题(2013020402)共同资助

摘　　要：周至地震台NS、NE和NW向测道地电阻率观测值2012年初开始出现显著趋势减小变化,经多次现场调查落实,认为变化与近年来农民在测区大规模搭建猕猴桃架有关。针对周至地震台地电阻率连续观测存在的环境干扰问题,建立环境干扰物理模型,模拟分析环境干扰对周至地电阻率观测的影响,并分析2012年以来趋势减小的可能干扰源。结果显示:2012年新搭建的猕猴桃架会造成周至地电阻率3测道观测值的趋势减小。当干扰电阻R=10Ω时,模拟结果与实际观测结果符合良好。The georesitivity observation data of Zhouzhi Seismic Station in NS-direction, NE-direc- tion and NW-direction began to display a significant decline trend from Jan. , 2012. After several times of field investigations, it is suggested that this decreased trend was correlated with the construction of the kiwifruit-supports by the farmers. In order to understanding the environmental interference on the continuous observation of georesitivity at Zhouzhi Seismic Station, the physical model of the interference were built in this paper. Based on this model, influences of the kiwifruit-supports on georisitivity observation at Zhouzhi Seismic Station is simulated and the possible interference source of the decreased trend was analyzed. The re- sults showed that： the new construction of kiwifruit-supports in Jan. , 2012 could cause the significant decline of the NS-direction, NE-direction and NW-direction georesitivity observa- tion at Zhouzhi Seismic Station. And the simulations are in good agreement with the observa- tions while R= 10Ω.

关 键 词：地电阻率 环境干扰 数值模拟 

分 类 号：P315.722[天文地球—地震学]