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[1]OUYANG Shupei,ZHOU Xiaocheng,HE Miao,et al.The Characteristics of the Hydrogeochemical Seismic Anomaly of Hot Springs in the Ning'er-Tongguan Volcanic Area[J].Journal of Seismological Research,2023,46(01):37-48.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0005 ]

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The Characteristics of the Hydrogeochemical Seismic Anomaly of Hot Springs in the Ning'er-Tongguan Volcanic Area

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 01 Page number: 37-48 Column: 地震地下流体监测预报理论及技术应用专栏 Public date: 2023-01-01

Title:: The Characteristics of the Hydrogeochemical Seismic Anomaly of Hot Springs in the Ning'er-Tongguan Volcanic Area

Author(s):: OUYANG Shupei¹; ZHOU Xiaocheng¹; HE Miao¹; TIAN Jiao¹; LI Jingchao¹; DONG Jinyuan¹; LI Ying¹; YAN Yucong¹; LIU Fengli¹; YAO Bingyu¹; WANG Yuwen¹; ZENG Zhaojun¹; CHEN Qufei²; LUO Zhixin¹; JI Gengfeng¹; (1.United Laboratory of High Pressure Physics and Earthquake Science,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(2.Economic and Technological Development Zone Brigade,Fire and Rescue Detachment of Urumqi,Fire and Rescue department of Xinjiang Uygur Autonomous Region,Urumqi 830009,Xinjiang,China)

Keywords:: hot-spring fluids; hydrogeochemistry; earthquake precursors; the Ning'er-Tongguan volcanic area

CLC:: P315.724

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0005

Abstract:: The hydrogeochemial characteristics reflect information of seismic activities.In this study,eight hot spring sites in Ning'er-Tongguan volcanic area of Yunnan Province are selected for sampling and analysis.The results are as follows:① Volcanic hot springs in Tongguan belong to six hydrogeochemical types:Na?Ca-HCO₃,Na?Cl-HCO₃,Na-HCO₃,Ca-HCO₃,Na?Ca-SO₄?HCO₃ and Na?Ca-Cl?SO₄.②The oxygen and hydrogen isotopes(δ¹⁸O and δD)range from 12.69‰ to-10.80‰ and-89.2‰ to-81.5‰ respectively.This indicates that the main source of the recharge for the hot springs is precipitation,and the recharge elevation ranges from 2.0 km to 2.7 km.③ The geothermal reservoir temperature of the hot springs,calculated by the hydrogeochemical temperature scale,ranges from 52.5 ℃ to 56.4 ℃.The circulation depth of hot springs was estimated from 1.1 km to 1.3 km.The main source of heat is from geothermal gradient and magma heat.④Before the 2020 Luchun Earthquake,The concentration of Na⁺,Cl^-,SO^2-₄in Qingping Hot Spring and Xisa Hot Spring rose synchronously.The Na⁺,Cl^-,SO^2-₄ions on three monitoring sites responded to the 2021 Shuangbai Earthquake.These ions had risen 5-10 days before the Shuangbai Earthquake,then fell to the average level after the earthquake.The seismic anomaly was related to the epicentral distance and earthquake magnitude.⑤The variation of tectonic stress field increased the permeability of the stratum,and then the water in the lower aquifer mixed up with that in the upper aquifer,therefore changed the compositions of the hot-spring water.And the short-term and impending seismic precursors appeared.

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Last Update: 2023-01-01