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地震 ›› 2009, Vol. 29 ›› Issue (3): 79-85.

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老虎山断裂带大地电磁地震监测研究

陈军营1,2, 杜学彬1,2, 谭大诚1,2, 安张辉1,2   

  1. 1.中国地震局兰州地震研究所, 甘肃 兰州 730000;
    2.中国地震局地震预测研究所兰州科技创新基地, 甘肃 兰州 730000
  • 收稿日期:2008-07-24 修回日期:2009-03-19 出版日期:2009-07-31 发布日期:2021-10-18
  • 作者简介:陈军营(1968-),男,山东东明人,副研究员,主要从事大地电磁测深及地震电磁等研究。
  • 基金资助:
    中国地震局专项; 兰州地震研究所论文(LC2009008)

Magnetotelluric Monitoring of Earthquakes in the Laohushan Fault Zone, Gansu Province

CHEN Jun-ying1,2, DU Xue-bing1,2, TAN Da-cheng1,2, AN Zhang-hui1,2   

  1. 1. Lanzhou Base of Institude of Earthquake Science, CEA, Lanzhou 730000, China;
    2. Lanzhou Institute of Seismology, CEA, Lanzhou 73000, China
  • Received:2008-07-24 Revised:2009-03-19 Online:2009-07-31 Published:2021-10-18

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摘要： 本文分析研究了2004年10月至2006年9月在老虎山断裂带附近一测点的5次大地电磁重复观测资料。 观测期间在其断裂带的近距测点十数公里处,发生了最大震级为ML4.6的一组3级以上地震。 揭示出了由大地电磁法观测到该地震活动过程所显示的深部电性变化的前兆特征,表明在震源区一相应深度范围在地震孕育过程中介质电阻率出现下降—上升—发震的变化过程。

关键词: 大地电磁测深, 断裂带, 响应函数, 地震监测

Abstract: In this paper, five repeated magnetotelluric sounding data at the Laohushan Fault Zone, Gansu province from Oct of 2004 to Sep of 2006 have been analyzed. In this period, a set of M>3.0 earthquakes occurred in the fault zone, with the largest ML4.6 about 10 km from the fault. The results indicate that the method of magnetotelluric sounding can observe the premonitory change of deep electric structure caused by seismic activity. The earthquake preparation process causes the resistivity of medium to drop, rise in the epicentral area and then earthquake occurs in the corresponding depth.

Key words: Magnetotelluric sounding, Laohushan fault zone, Response function, Earthquake monitoring

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