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地震 ›› 2000, Vol. 20 ›› Issue (4): 45-49.

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地电阻率年变化与气象因素及水位的关系

田山1, 郑文俊1, 关华平2, 高玉柱1, 程瑞年1   

  1. 1.天津市地震局, 天津 300201;
    2.中国地震局分析预报中心, 北京 100036
  • 收稿日期:2000-01-03 修回日期:2000-04-06 出版日期:2000-10-31 发布日期:2022-09-22
  • 作者简介:田山 (1952-),男,天津市人, 高级工程师,主要从事地震预报研究。

The relation between annual variation of earth resistivity and meteorologic factors and water table

TIAN Shan1, ZHENG Wen-jun1, GUAN Hua-ping2, GAO Yu-zhu1, CHENG Rui-nian1   

  1. 1. Seismological Bureau of Tianjin Municipality, Tianjin 300201, China;
    2. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:2000-01-03 Revised:2000-04-06 Online:2000-10-31 Published:2022-09-22

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摘要： 为了消除ds 观测资料中的年周期变化,对宝坻、塘沽地震台的地电阻率观测资料与台站附近地区的气压、气温、相对湿度、水位及海水水位的同期资料进行了相关处理分析, 并对地电阻率年周期变化产生的原因进行了分析,认为产生地电阻率与气象要素年周期变化的外因是同一源场作用的结果。 而地电阻率变化的内因,则是基于地下咸水层厚度的改变及地壳应力场的变化。 采用最小二乘法由气象参量和水位变化拟合出地电阻率模型值, 并计算出观测值与拟合值的残差,以消除电阻率观测资料中的年周期变化。结果表明, 近年来华北地区发生的 6级左右地震前,在宝坻、塘沽地震台的观测资料中均存在明显的短期前兆异常。

关键词: 地电阻率, 年周期变化, 气象因素, 水位, 相关分析, 地震前兆异常

Abstract: To eliminate the annual cyclic variation in the ds observational data, we analyzed the correlation between the observed data of earth resistivity at Baodi and Tanggu seismic stations, and the data of the g as pressure, air temperature, relative humidity, water table and seawater level nearby during the corresponding period. We also analyzed the reasons why annual variation of earth resistivity is induced. We consider that the external agencies of the variation of earth resistivity and meteorologic factors are induced by the connate field. In addition, the intrinsic agencies of variation of earth resistivity is based on the change of the thickness of the underground saline water layer and stress of earth crust. Using weather parameter and water table variation, we fit the model value of earth resistivity by least square method; and calculated its residual error. Finally, we eliminated the annual cyclic variation in the observed data of the earth resistivity. The result shows that the short-term precursor anomaly has been existed in the observed data of Baodi and Tanggu seismic stations before earthquake with M≈ 6 occurred in North China.

Key words: Earth resistivity, Annual cyclic aviation, Weather factor, Water table, Correlation analysis, Seismic short-term precursor anomaly

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