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Fang Zhen, Huang Xianliang, Wang Xiaoli, Yang Yuanyuan, Ni Hongyu, Zhang Bin. 2020: The post seismic effect of far-field strong earthquakes of water radon and its mechanism analysis for L01 well of Lujiang geothermal hot spring. Acta Seismologica Sinica, 42(6): 732-744. DOI: 10.11939/jass20200005
Citation: Fang Zhen, Huang Xianliang, Wang Xiaoli, Yang Yuanyuan, Ni Hongyu, Zhang Bin. 2020: The post seismic effect of far-field strong earthquakes of water radon and its mechanism analysis for L01 well of Lujiang geothermal hot spring. Acta Seismologica Sinica, 42(6): 732-744. DOI: 10.11939/jass20200005
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The post seismic effect of far-field strong earthquakes of water radon and its mechanism analysis for L01 well of Lujiang geothermal hot spring

  • 1.

    Anhui Earthquake Agency，Hefei 230031，China

  • 2.

    Mengcheng National Geophysical Observatory，Anhui，Mengcheng 233500，China

  • 3.

    National Institute of Natural Hazard，Beijing 100085，China

More Information
  • Received Date: February 03, 2020
  • Revised Date: April 19, 2020
  • Available Online: August 26, 2020
  • Published Date: November 14, 2020
    Graphical Abstract
    • Abstract
  • The Lujiang geothermal hot spring well No.1 is located on the Tanlu fault zone, where hydro-radon response to teleseism were observed. Nine geochemistry samples from the observation wells, geothermal hot spring wells and surface water along Anhui section of Tanlu fault zone were collected. The potential triggering mechanism was studied by analyzing the anion and isotope contents, as well as the source depth of the retrieved samples. The results show that the hydrochemical type is complex. The concentrations of Cl− within L01, L03, L07 and SC wells are high, whereas the concentration ratios of HCO−3/ Cl− and SO2−4/Cl− are low, implying a strong interaction between the surface water and underground hot water, The L11 well has a large proportion of mixed cold water, and the depth of a heat source is low for L03. Water samples from Lujiang and Shucheng hot spring wells might come from crust, having moreinformation of deep tectonic activities, since the L01 and SC have the highest surface temperature and circulation depth of L01 is the deepest. The estimated depth is 12 km by calculating the Na-K-Mg concentrations. In addition, the results indicate that Lujiang geothermal hot spring well No.1 is dominated by vertical recharge and has a deeper heat source. Seismic waves could have caused weak regional tectonic activities, which change the supply of deep heat source, and cause the high hydro-radon concentrations observed.
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