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.

References

[1] 杜学彬. 在地震预报中的两类视电阻率变化[J]. 中国科学: 地球科学, 2010, 40(10): 1321-1330.
DU Xue-bin. Two types of changes in apparent resistivity in earthquake prediction[J]. Science in China: Earth Sciences, 2010, 40(10): 1321-1330 (in Chinese).
[2] 徐锡泉, 高昌志, 王亮. 内蒙古宝昌台地电阻率长期观测数据研究[J]. 地震工程学报, 2014, 36(2): 405-412.
XU Xi-quan, GAO Chang-zhi, WANG Liang. Study on long-term observation data of earth resistivity at Baochang station, Inner Mongolia[J]. Journal of Earthquake Engineering, 2014, 36(2): 405-412 (in Chinese).
[3] 钱家栋, 陈有发, 金安忠. 地电阻率法在地震预报中的应用[M]. 北京: 地震出版社, 1985.
QIAN Jia-dong, CHEN You-fa, JIN An-zhong. Application of earth resistivity method in earthquake prediction[M]. Beijing: Seismological Press, 1985 (in Chinese).
[4] 钱家栋, 曹爱民. 1976年唐山7.8级地震地电阻率和地下水前兆综合物理机制研究[J]. 地震, 1998, 18(增刊): 1-9.
QIAN Jia-dong, CAO Ai-min. Research on comprehensive mechanism of precursors in apparent resistivity and water table associated with 1976 Tangshan earthquake (M=7.8)[J]. Earthquake, 1998, 18(S1): 1-9 (in Chinese).
[5] 钱家栋, 马钦忠, 李劭秾. 汶川M_S8.0地震前成都台NE测线地电阻率异常的进一步研究[J]. 地震学报, 2013, 35(1): 4-17.
QIAN Jia-dong, MA Qin-zhong, LI Shao-nong. Further study on the anomalies in apparent resistivity in the NE configuration at Chengdu station associated with Wenchuan M_S8.0 earthquake[J]. Acta Seismologica Sinica, 2013, 35(1): 4-17 (in Chinese).
[6] Park S K, Van G P. Inversion of pole-pole data for 3-D resistivity structure beneath arrays of electrodes[J]. Geophysics, 1991, 56(7): 951-960.
[7] Lu J, Xue S Z, Qian F Y, et al. Unexpected changes in resistivity monitoring for earthquakes of the Longmen Shan in Sichuan, China, with a fixed Schlumberger sounding array[J]. Physics of the Earth and Planetary Interiors, 2004, 145(1-4): 87-97.
[8] Lu J, Qian F Y, Zhao Y L. Sensitivity analysis of the Schlumberger monitoring array: Application to changes of resistivity prior to the 1976 earthquake in Tangshan, China[J]. Tectonophysics, 1999, 307(3-4): 397-405.
[9] Cook K L, Gray R L. Theoretical horizontal resistivity profiles over hemispherical sinks[J]. Geophysics, 1961, 9(3): 342-354.
[10] 解滔, 卢军. 地电阻率三维影响系数及其应用[J]. 地震地质, 2015, 37(4): 1125-1135.
XIE Tao, LU Jun. Three-dimensional sensitivity coefficient of apparent resistivity and preliminary application[J]. Seismology and Geology, 2015, 37(4): 1125-1135 (in Chinese).
[11] O’Neill D J, Merrick N P. A digital linear filter for resistivity sounding with a generalized electrode array[J]. Geophysical Prospecting, 1984, 32(1): 105-123.
[12] 姚文斌. 电测深数值计算和解释入门[M]. 北京: 地震出版社, 1989.
YAO Wen-bin. Introduction to numerical computation and interpretation of electrical sounding[M]. Beijing: Seismological Press, 1989 (in Chinese).
[13] 李金铭. 地电场与电法勘探[M]. 北京: 地质出版社, 2005.
LI Jin-ming. Geoelectric field and electrical prospecting[M]. Beijing: Geological Publishing House, 2005 (in Chinese).
[14] Lowry T, Allen M B, Shive P N. Singularity removal: A refinement of resistivity modeling techniques[J]. Geophysics, 1989, 54(6): 766-774.
[15] Zhao S K, Yedlin M J. Some refinements on the finite-difference method for 3-D dc resistivity modeling[J]. Geophysics, 1996, 61(5): 1301-1307.
[16] Coggon J H. Electromagnetic and electrical modeling by the finite element method[J]. Geophysics, 1971, 36(1): 132-155.
[17] Dey A, Morrison H F. Resistivity modeling for arbitrarily shaped three-dimensional structures[J]. Geophysics, 1979, 44(4): 753-780.
[18] Li Y G, Spitzer K. Finite element resistivity modeling for three-dimensional structures with arbitrary anisotropy[J]. Physics of the Earth and Planetary Interiors, 2005, 150(1-3): 15-27.
[19] 解滔, 王洪岐, 刘立波, 等. 四平台地电阻率相反年变有限元数值分析[J]. 地球物理学进展, 2014, 29(2): 588-594.
XIE Tao, WANG Hong-qi, LIU Li-bo, et al. Inverse annual variations of apparent resistivity at Siping earthquake station by using finite method[J]. Progress in Geophysics, 2014, 29(2): 588-594 (in Chinese).
[20] 杜学彬, 孙君嵩, 陈军营. 地震预测中的地电阻率数据处理方法[J]. 地震学报, 2017, 39(4): 531-548.
DU Xue-bin, SUN Jun-song, CHEN Jun-ying. Processing methods for the observation data of georesistivity in earthquake prediction[J]. Acta Seismologica Sinica, 2017, 39(4): 531-548 (in Chinese).
[21] 于磊, 陈俊, 刘泽民, 等. 合肥形变台地电阻率观测映震能力分析[J]. 华南地震, 2019, 39(2): 79-85.
YU Lei, CHEN Jun, LIU Ze-min, et al. Seismic reflectivity analysis of ground resistivity observation at Hefei deformation station[J]. South China of Seismology, 2019, 39(2): 79-85 (in Chinese).

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

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