云南盈江—龙陵断裂带温泉水文地球化学与地震短临前兆异常特征研究

doi:10.12196/j.issn.1000-3274.2025.02.013

Abstract

Abstract: As significant indicators of deep-Earth material migration, the hydrochemical dynamics of fault-zone hot springs can effectively reflect regional tectonic activities and seismic preparation processes. This study presents a retrospective analysis of precursory hydrochemical responses to seismic events, based on continuous monitoring data (August 2021—January 2024) from the Mangke (MK) and Banglazhang (BLZ) hot springs along the Yingjiang-Longling Fault Zone in Yunnan Province. The results demonstrate that: ① Both springs exhibit Na-HCO^-₃ type hydrochemical characteristics, suggesting contributions from deep-source materials; ② Stable isotope compositions (δ18O=-11.0‰~-8.8‰, δD=-77.8‰~-65.0‰) confirm meteoric water as the primary recharge source, with recharge elevations of 1.5~2.0 km calculated through isotopic altitudinal effects; ③ Time-series analysis reveals precursory anomalies in hydrogen/oxygen isotopes and Na⁺, Cl^-, SO^2-₄ concentration, showing statistically correlations with earthquakes. These findings validate hydrogeochemical parameters as effective indicators for earthquake precursor monitoring in this region, providing a certain basis of geochemical observations for seismic forecasting in western Yunnan.

Key words: Hot springs, Earthquakes, Hydrogeochemistry, Precursory anomalies, Yingjiang-Longling Fault Zone

CLC Number:

P315.7

QIN Shuang-long, ZENG Zhao-jun, ZHOU Xiao-cheng, HE Miao, TIAN Jiao, HONG Xu-yu. Study on the Hot spring Hydrogeochmistry and Their Anomalous Characteristics of Short-term and Impending Earthquake Precursors at Yingjiang[J]. EARTHQUAKE, 2025, 45(2): 193-210.

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Study on the Hot spring Hydrogeochmistry and Their Anomalous Characteristics of Short-term and Impending Earthquake Precursors at Yingjiang

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