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EARTHQUAKE ›› 2021, Vol. 41 ›› Issue (2): 113-128.doi: 10.12196/j.issn.1000-3274.2021.02.009

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Hydrogeochemical Anomaly Characteristics of Hot Springs Around the 2020 Yutian MS6.4 Earthquake, Xinjiang

YAN Yu-cong, ZHOU Xiao-cheng, LI Jing-chao, LIU Feng-li, OUYANG Shu-pei   

  1. Key Laboratory of Earthquake Forecast, Institute of Earthquake Forecasting, CEA, Beijing 100036, China
  • Received:2021-01-11 Revised:2021-02-12 Online:2021-04-30 Published:2021-08-06

Abstract: The spatial-temporal variations of fluid geochemistry in two hot springs within 80 km of the epicenter of Yutian MS6.4 earthquake were studied from September 2019 to October 2020. The results show that: ① the meltwater from the Kunlun Mountains act as the water source of the hot springs. ② The recharge elevation is 6 km of Kezileshayi and the types of water chemistry is Na-HCO3 and Partially equilibrium water and the circulation depth is about 1.7 km and the main gas group is N2 and mantle derived helium accounts for 10.6%. ③ The recharge height of Wushikaibulong is 3.1 km, the hydrochemical type is Ca·Na-HCO3·SO4, immature water, the circulation depth of the hot spring reach about 0.5 km which may have mixed with shallow cold water. The hydrogeochemical response to the earthquake in the region of Wushikaibulong was obvious. The regional stress has obvious changes within the fault fissure before the earthquake of MS6.4 in Jiashi which cause hot fluid behavior change and the ion concentration of Wushikaibulong hot spring increased slightly, the concentration of Cl- also increased sharply 16 days after the MS6.4 Yutian earthquake. Therefore, the continuous monitoring of fluid geochemical characteristics in Wushikaibulong and Kezileshayi hot springs could provide an effective indicator for judging the seismic risk in the intersection area of Aerjin fault and West Kunlun fault.

Key words: Fluid geochemical, Hot spring, Aftershock response, the 2020 Yutian MS6.4 earthquake

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