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EARTHQUAKE ›› 2024, Vol. 44 ›› Issue (3): 108-123.doi: 10.12196/j.issn.1000-3274.2024.03.008

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Hydrogeochemical Characteristics of Hongmo Hot Spring in Sichuan Province and Its Relationship with Earthquakes

LI Jing-chao, ZHOU Xiao-cheng, HE Miao, YAN Yu-cong, TIAN Jiao, DONG Jin-yuan   

  1. United Laboratory of High Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
  • Received:2024-04-30 Accepted:2024-06-26 Online:2024-07-31 Published:2024-08-28

Abstract: Hydrogeochemical methods of hot springs are widely used in the research of seismic short-impending precursors. Hongmo hot spring is located in the southern section of the Anninghe fault. According to the analysis of the major elements in the water samples from Hongmo hot spring, its main hydrochemical type is Na-HCO3. The test of hydrogen and oxygen isotopes in Hongmo hot spring shows that meteoric water is the modern recharge of groundwater, with a replenishment elevation of about 407~619 m. The analysis of trace elements indicates that there is a low degree of water-rock interaction between the hot spring water and surrounding rock during the water cycle. According to the SiO2 temperature scale, the heat storage temperature is 63.7℃, and the cycling depth is 2.52 km. Research on the relationship between the hydrogeochemical characteristics of Hongmo hot spring and earthquakes shows that before and after the 2020 Qiaojia M5.0 earthquake, 2022 Ninglang M5.5 earthquake, 2022 Lushan M6.1 earthquake, and 2024 Ludian M4.9 earthquake, the Cl-, Na+, SO2-4, and δD showed different degrees of anomalies. Therefore, Hongmo hot spring is an ideal site for short-impending seismic monitoring through hydrogeochemistry.

Key words: Anninghe fault, Hongmo hot spring, Hydrogeochemistry, Earthquakes

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