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地震 ›› 2017, Vol. 37 ›› Issue (4): 102-111.

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河北兴济地电阻率干扰定量分析

张国苓, 贾立峰, 乔子云, 郭学增, 牛淑瑜   

  1. 河北省地震局, 河北 石家庄 050021
  • 收稿日期:2017-01-25 发布日期:2019-08-09
  • 作者简介:张国苓(1986-), 女, 河北石家庄市人, 工程师, 主要从事电磁学和地震预测研究等。
  • 基金资助:
    中国地震局震情跟踪定向工作任务青年课题(2015010403)和中国地震局地震科技星火计划项目(XH17004Y)资助

Quantitative Analysis of Georesistivity Disturbances at Xingji Station, Hebei Province

ZHANG Guo-ling,JIA Li-feng,QIAO Zi-yun,GUO Xue-zeng,NIU Shu-yu   

  1. Earthquake Administration of Hebei Province, Shijiazhuang 050021, China
  • Received:2017-01-25 Published:2019-08-09

摘要: 结合电测深曲线、 岩性资料建立三维水平层状结构物理模型, 利用有限元法定量计算挖土水坑蓄水量和砖厂建设对兴济N60°W向地电阻率观测的影响。 研究结果显示, 测区内挖土水坑位于影响系数为负的区域, 夏季水位高时为低阻体, 冬季无水时为高阻体, 蓄水量的季节性变化导致N60°W向地电阻率具有冬低夏高的反向年变。 砖厂厂房由砖混结构改建为钢架结构, 位于测区影响系数为负的区域, 局部形成的低阻体引起N60°W测向地电阻率的趋势上升变化。

关键词: 地电阻率, 环境干扰, 数值模拟, 兴济台

Abstract: In order to study environment interferences (excavation puddle and steel structure workshop) on the observation of georesistivity, we built a three-dimensinal finite element physical model of the interference based on electric sounding data and lithologic data at Xingji seismic station to do quantitative analysis. Both of excavation puddle and steel structure workshop are built at intermediate electrode N4 and the power supply electrode B4 in the measured area which is at minus sensitivity coefficient. The excavation puddle is a low resistivity body in summer when the water level is high, on the contrary, the excavation puddle is a high resistivity body in winter when the water level is low. Analyzed results of the model suggest that reverse of annual variation of georesistivity at N60°W direction was due to the seasonal changes of water storage in excavation puddle. Steel structure of brick factory is a low resistivity in the test area. The trend of rising change of the georesistivity in N60°W direction since April 2016 was caused by reconstruction of steel structure workshop.

Key words: Georesistivity, Environmental interferences, Numerical simulation, Xingji seismic station

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