合肥形变台地电阻率NS向数据异常的解释

doi:10.12196/j.issn.1000-3274.2022.03.013

Abstract

Abstract: The earth resistivity always shows reverse change in NS direction and EW direction at Hefei deformation station, however the data of the two directions showed positive change from October 2018 to February 2019. After checking, it is found that there is a reservoir between the NS power supply level and the measuring pole, and in October 2018 the water level of the reservoir was significantly reduced due to pumping. At this time, the resistivity at NS direction did not increase but decrease that formed a paradox. In this paper, the three-dimensional influence coefficient is calculated by using finite element numerical analysis method. The results show that there is a negative region between the supply electrode and the measuring electrode, and a semi-ellipsoid region along the measuring profile. The closer it is to the electrode, the longer the absolute value of influence coefficient becomes. It is concluded that the abnormal change in NS resistivity is caused by the pumping of water from the reservoir, and the calculated results are consistent to the observed data. This result provides reference for solving similar problems in the future.

Key words: Three-dimensional influence coefficient, Finite element, Solution paradox, Layered medium

CLC Number:

P315.7

YU Lei, CHEN Jun, HE Kang, LIU Ze-min, LI Zhe-jun. Explanation for the Anomalies of the Ground Resistivity in NS Direction at Hefei Deformation Station[J]. EARTHQUAKE, 2022, 42(3): 180-191.

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Explanation for the Anomalies of the Ground Resistivity in NS Direction at Hefei Deformation Station

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