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SU Hejun, WANG Zongli, CAO Lingling, ZHANG Hui, LI Chenhua, ZHOU Huiling. 2020. The application of measurement method of soil gas from fault zone to fault activity study: A case study of Jiayuguan fault[J]. Geology in China, 47(6): 1894-1903. doi: 10.12029/gc20200623
Citation: SU Hejun, WANG Zongli, CAO Lingling, ZHANG Hui, LI Chenhua, ZHOU Huiling. 2020. The application of measurement method of soil gas from fault zone to fault activity study: A case study of Jiayuguan fault[J]. Geology in China, 47(6): 1894-1903. doi: 10.12029/gc20200623
shu

The application of measurement method of soil gas from fault zone to fault activity study: A case study of Jiayuguan fault

  • 1.

    Lanzhou Institute of Geotechnical Earthquake, CEA, Lanzhou 730000, Gansu, China

  • 2.

    Gansu Earthquake Agency, Lanzhou 730000, Gansu, China

  • 3.

    College of Earth and Environmental Sciences of Lanzhou University, Lanzhou 730000, Gansu, China

    • Fund Project: Supported by the project of"Special Project for Earthquake Monitoring and Prediction of CEA (No. ZX2017031) and Natural Science Foundation of Gansu, China (No. 1606RJYA218)"
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  • Author Bio: SU Hejun, male, born in 1973, associate researcher, mainly engages in the study of fault gas and isotope geochemistry; E-mail:suhejun@126.com
  • Corresponding author: CAO Lingling, female, born in 1972, associate researcher, mainly engages in the study of using underground fluid to predict earthquake; E-mail:caoll@gsdzj.gov.cn 
Received Date:  18 January 2018
Revised Date:  18 July 2018
Publish Date:  25 December 2020
    Abstract

  • In order to determine whether the increase of gas radon concentrations at the monitoring point of the Jiayuguan fault since June 2015 can reflect the stronger activity of the Jiayuguan fault or not, the authors applied the cross-fault measurement method based on the typical distribution pattern of soil gas across faults and analyzed comprehensively the relationship between the abnormal changes of gas radon concentrations and the fault activity through multi-component correlation analyzing and theoretical modeling. The results show that the concentrations of CO2, CH4, and H2 from the same monitoring point do not increase during the rapid increase of the gas radon concentrations from the monitoring point of the fault. There is no positive correlation between them. The adding of gas radon concentration does not come from deep crust and it does not mean the stronger activity of the Jiayuguan fault. The results of the gas radon measurement across faults which lie on both sides of the monitoring point show that the gas radon concentrations are different, and this is consistent with the typical distribution pattern of fault gas on the unchanged side of the surface environment but it does not conform to the typical distribution pattern of fault gas on the changed side of the surface environment. The increase of gas radon concentrations is correspondingly with the change of the surface environment in time. Therefore, the increase of gas radon concentration at the fault monitoring point is caused by the change of the surface environment, and the activity of the Jiayuguan fault does not increase. This method provides a thinking for the improvement of reliability in using fault soil gas to judge fault activity.

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