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Zhang M D，Liu J B，Zhang W，Wu B Y，Liao X F. 2023. Cause for abnormal decline of DC apparent resistivity at Tanggu station in Tianjin. Acta Seismologica Sinica，45（4）：671−684. DOI: 10.11939/jass.20220044
Citation: Zhang M D，Liu J B，Zhang W，Wu B Y，Liao X F. 2023. Cause for abnormal decline of DC apparent resistivity at Tanggu station in Tianjin. Acta Seismologica Sinica，45（4）：671−684. DOI: 10.11939/jass.20220044
shu

Cause for abnormal decline of DC apparent resistivity at Tanggu station in Tianjin

  • 1.

    Tianjin Earthquake Agency，Tianjin 300021，China

  • 2.

    Office of Human Resources，Nankai University，Tianjin 300071，China

  • 3.

    Sichuan Earthquake Agency，Chengdu 610041，China

More Information
  • Received Date: April 01, 2022
  • Revised Date: July 15, 2022
  • Available Online: June 29, 2023
  • Published Date: July 14, 2023
    Graphical Abstract
    • Abstract
  • The decline of DC apparent resistivity is a common abnormal variation in electromagnetic forecast, the reason is the change of underground electrical structure caused by rock stress change. Therefore, it is very important for timely identification and scientific judgment of earthquake precursory anomalies to effectively analyze their genetic properties. The EW direction of the resistivity of Tanggu station showed a downward trend since 2013, and the low value in 2021 was significantly lower than previous years, which was a breaking anomaly in the downward trend. The low range was 0.104 Ω·m, accounting for about 1% of the background value, and the low value time was delayed compared with previous years. Based on the hydrologic environment, geological structure and dynamic characteristics of the area where Tanggu station is located, we discussed the influence and genetic mechanism of surface water storage capacity, underground static water level and tectonic deformation. The results show that the long-term tectonic displacement change and the decline of groundwater static water level are the main reasons for the decline of the resistivity trend, and the large short-term precipitation and long rainy season, together with the favorable surface water storage capacity, are the main reasons for the formation of the break year change pattern. Although there is no conclusive evidence that is precursory information in the apparent resistivity anomaly of Tanggu station, the analytical method adopted in this paper can still provide useful reference for the typical anomaly pattern.
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    • References (47)
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