SEISMOLOGY AND GEOLOGY ›› 2009, Vol. 31 ›› Issue (3): 551-558.DOI: 10.3969/j.issn.0253-4967.2009.03.016

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CONTINUOUS ELECTROMAGNETIC MEASUREMENT AT STATIONARY STATIONS AND ITS APPLICATION TO EARTHQUAKE PREDICTION RESEARCH

TIAN Shan1, TANG Ji2, WANG Jian-guo1, XU Xue-gong1, CUI Xiao-feng1, ZHANG Ming-dong1, CAO Jing-quan1   

  1. 1. Earthquake Administration of Tianjin Municipality, Tianjin 300201, China;
    2. Institute of Geology, China Earthquake Administration, Beijing 100029, China
  • Received:2009-02-09 Revised:2009-07-16 Online:2009-09-09 Published:2009-12-11

电磁场定点连续观测在地震预测研究中的应用

田山1, 汤吉2, 王建国1, 徐学恭1, 崔晓峰1, 张明东1, 曹井泉1   

  1. 1. 天津市地震局, 天津, 300201;
    2. 中国地震局地质研究所, 北京, 100029
  • 通讯作者: 汤吉,研究员,E-mail:tangji@ies.ac.cn。
  • 作者简介:田山,男,1952生,1976年于河北地质学院地球物理勘探系物探专业毕业,研究员,主要从事电磁学与地震预测研究工作,现从事地电观测技术和电磁短临预测技术研究,电话:13920175999,E-mail:ts520739@sina.com.
  • 基金资助:
    天津市科技支撑计划重点项目(09ZCKFSF00700,07ZCGYSF03100);中国地震局监测预报司三结合项目(082001);国家自然科学基金(405740031)共同资助

Abstract: Based on the synchronized observation data of 1s sampling rate Network MT(N-MT)system with FHDZ-M15 geo-magnetometer installed at Jinghai seismic observatory in the "Tenth Five-Year Program" period,we carried out the MT measurement at a stationary station. Robust technology was employed in data processing to the data recorded at Jinghai observatory from January to June,2008. The tensor impedances were obtained. The temporal abnormal change of 18 apparent resistivity and impedance phases of same-period in the range of periods of 6~600s was analyzed. The results show there exist changes in some periods of apparent resistivity and impedance phases before the ML 4.2 Lulong earthquake on March 17,2008. In this study,the period of data used corresponds to the depth of 5~ 50km,a range of focal depth of North China. The result indicates the change of electrical conductivity of the strata in the source area before and after the earthquake. The MT method can reflect the electrical conductivity changes at the source area more directly than the existing geoelectric observation methods,and it has bigger advantage for deeper exploration.

Key words: electromagnetic filed, MT, apparent resistivity, phase, earthquake precursor, Jinghai Observatory

摘要: 文中利用"十.五"期间静海地震台布设的秒采样大地电磁网(N-MT)仪器系统和FHDZ-M15地磁组合系统的同步观测数据,实现了固定台站大地电磁测深(MT)观测。采用Robust技术对静海地震台2008年1—6月记录的天然电磁场观测数据进行了MT处理,得到了张量阻抗资料。经过对周期为6~600s范围的18个相同周期的视电阻率及阻抗相位随时间的变化进行分析,其中有多个周期的视电阻率及阻抗相位的时序曲线在2008年3月11日卢龙ML4.2地震前出现异常变化。研究使用的资料周期对应深度为5~50km,属华北地震震源深度范围,其结果反映了震源区地层地震前后震源深度的电性变化。MT方法比现行的地电观测方法具有更直接反映震源区地层的电性变化和更深的勘探深度的优势。

关键词: 电磁场, 大地电磁测深, 视电阻率, 阻抗相位, 地震前兆, 静海地震台

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