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Interference Analysis of DC and AC Geoelectrical Resistivity Observations on Geomagnetic Records at Chengdu Earthquake Monitoring Center Station
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Xuehao LI1, Guochao LI1, Guiyuan LI1, Kang GONG1, Siyuan HE1
Journal of Geodesy and Geodynamics | 2025, 45(9) : 944 - 949
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Journal of Geodesy and Geodynamics | 2025, 45(9): 944-949
Interference Analysis of DC and AC Geoelectrical Resistivity Observations on Geomagnetic Records at Chengdu Earthquake Monitoring Center Station
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Xuehao LI1, Guochao LI1, Guiyuan LI1, Kang GONG1, Siyuan HE1
Affiliations
  • 1 Chengdu Earthquake Monitoring Center Station of Sichuan Earthquake Agency, 136 Southwest Section of Yihuan Road, Pidu District, Chengdu 611730, China

    • LI Xuehao, engineer, majors in earthquake monitoring, E-mail:

About Author:

LI Xuehao, engineer, majors in earthquake monitoring, E-mail:

Published: 2025-09-15 doi: 10.14075/j.jgg.2024.09.439
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We conduct experiments on the parallel operation of DC and AC geoelectrical resistivity observation systems at Chengdu earthquake monitoring center station by setting different power supply parameters, and summarize the interference characteristics of different geoelectrical resistivity observation systems on geomagnetic records at the same station. The results show that the interference caused by DC geoelectrical resistivity observation on geomagnetic records is in the form of positive and negative large amplitude square waves, and the output current amplitude is positively correlated with the interference amplitude. The interference caused by AC geoelectrical resistivity observation on geomagnetic records is in the form of large amplitude sine waves, and will not interfere geomagnetic records when the output current frequency is 1-10 Hz and the output current amplitude is 0.1-0.5 A. In addition, based on the experimental results of AC geoelectrical resistivity observation, we simulate the amplitude frequency characteristic curve of the FGM-01 fluxgate magnetometer, which conforms to the frequency response characteristics of a low-pass filter.

DC and AC geoelectrical resistivity observation  /  geomagnetic observation  /  interference analysis
李雪浩, 李国超, 李贵元, 龚康, 何思源. 地电阻率直流和交流观测对成都中心站地磁记录的干扰分析. 大地测量与地球动力学, 2025 , 45 (9) : 944 -949 . DOI: 10.14075/j.jgg.2024.09.439
Xuehao LI, Guochao LI, Guiyuan LI, Kang GONG, Siyuan HE. Interference Analysis of DC and AC Geoelectrical Resistivity Observations on Geomagnetic Records at Chengdu Earthquake Monitoring Center Station[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (9) : 944 -949 . DOI: 10.14075/j.jgg.2024.09.439
Funding
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  • Combination Project with Monitoring, Prediction and Scientific Research of Earthquake Technology, CEA(3JH-202401089)
  • Science and Technology Project of Sichuan Earthquake Agency(LY2224)
Appendix
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Year 2025 volume 45 Issue 9
23
9
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Article Info
doi: 10.14075/j.jgg.2024.09.439
  • Receive Date：2024-09-20
  • Online Date：2026-10-29
  • Published：2025-09-15
Article Data
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History
  • Received：2024-09-20
Funding
Combination Project with Monitoring, Prediction and Scientific Research of Earthquake Technology, CEA(3JH-202401089)
Science and Technology Project of Sichuan Earthquake Agency(LY2224)
Affiliations
    1 Chengdu Earthquake Monitoring Center Station of Sichuan Earthquake Agency, 136 Southwest Section of Yihuan Road, Pidu District, Chengdu 611730, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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Genus		 种数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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