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地震 ›› 2005, Vol. 25 ›› Issue (2): 115-121.

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武都地电阻率在岷县5.2级地震前的异常变化

高曙德1, 苏永刚1, 王君平2, 郝臻2, 王军燕1, 赵洁3   

  1. 1.甘肃省武都中心地震台, 甘肃 武都 746000;
    2.甘肃省地震局, 甘肃 兰州 730000;
    3.甘肃省嘉峪关地震台, 甘肃 嘉峪关 737000
  • 收稿日期:2004-06-28 修回日期:2004-10-28 出版日期:2005-04-30 发布日期:2021-11-10
  • 作者简介:高曙德(1970-), 男, 甘肃秦安人, 工程师, 主要从事地震监测与预报研究。

Geoelectric anomalies at Wudu station before Minxian MS5.2 earthquake

GAO Shu-de1, SU Yong-gang1, WANG Jun-ping2, HAO Zhen2, WANG Jun-yan1, ZHAO Jie3   

  1. 1. Wudu Seismological Station, Wudu 746000, Gansu;
    2. Earthquake Administration of Gansu Province, Lanzhou 730000;
    3. Jiayuguan Seismic Station, Jiayuguan 737000, Gansu, China
  • Received:2004-06-28 Revised:2004-10-28 Online:2005-04-30 Published:2021-11-10

摘要: 2003年11月岷县5.2级地震前武都台地电阻率资料出现了明显前兆异常, N85°E测道电阻率资料出现了典型的“勺形”变化, N73°W测道电阻率自2002年5月打破正常年变化形态, 2003年8月开始急剧升高。 研究结果认为, 从出现地电阻率异常到发震, 两测道各向异性变化明显, 各向异性度S′最大变化量超过了正常年变化的二倍。

关键词: 岷县MS5.2地震, 地电阻率异常, 地下水, 各向异性度S′

Abstract: the earth resistivity data show an obvious anomaly at Wudu station before Minxian MS5.2 earthquake in November 2003. A typical scoop-like variation appeared for the N85°E geoelectric configuration. The regular year variation feature is broken from May 2002, and the value of N73°E configuration rapidly rises from August 2003. The research result indicates that the anisotropic variations of them are remarkable from the time when the anomalies appeared to the time when the earthquake occurred. The maximum change of anisotropic index S′ is more than tow time of the value of regular year variation.

Key words: Minxian MS5.2 earthquake, Earth resistivity anomaly, Groundwater, Anisotropic index S′

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