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EARTHQUAKE ›› 2015, Vol. 35 ›› Issue (1): 112-122.

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Assessment of Ground and Borehole Resistivity Data Observed from the Same Site

LIU Jun1,2, DU Xue-bin1,2, CHEN Jun-ying1,2, WANG Jian-yun1,2, FAN Ying-ying1,2   

  1. 1. Lanzhou Base of Insitiute of Earthquake Prediction, CEA, Gansu 730000, China;
    2. Lanzhou National Observatory of Geophysics, Gansu 730000, China
  • Received:2014-05-04 Online:2015-01-31 Published:2020-06-22

Abstract: This paper presents observational data of the 4 stations of surface and deepwell equipments which running time over 2 years at the same site and the same time period. By analyzing dynamic change of curves, observation accuracy and earthquake reflecting ability of the observed data, we concluded that ① Deep borehole resistivity observation better restrain interferences of winding, raining and stray currents ground observation; ② Annual variation amplitude of deepwell is different from surface resistivity observations and can greatly weaken the amplitude of annual variation; ③ Deepwell vertical observation data shows more frequently step offsets and sudden jumps relative to horizontal observation data; ④ Deepwell observation of Tianshui, Heyuan and Haian stations have good reflecting ability to earthquake nearby.

Key words: Deep-well resistivity observations, Surface Resistivity observation, Earthquake activity

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