Hydrochemical Characteristics of Groundwater at the Epicenter of the 2021 Biru M6.1 Earthquake in Central Tibet
Hydrochemical Characteristics of Groundwater at the Epicenter of the 2021 Biru M6.1 Earthquake in Central Tibet
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DOI：
10.3390/w13213111
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发表时间：
2021-11
期刊：
影响因子：
3.4
通讯作者：
Pengtao Yang;Xiaolong Sun;Dongying Liu;Zhongtai He;Yongsheng Li
中科院分区：
文献类型：
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作者：
Pengtao Yang;Xiaolong Sun;Dongying Liu;Zhongtai He;Yongsheng Li
地下水对于水安全和生态环境保护无疑具有重要意义，特别是在地震地区。分析震后地下水的特征和变化对于更好地了解地震风险和合理管理地下水资源具有重要意义。本研究使用 23 个水样，调查了 2021 年中国西南部西藏中部比如 M6.1 地震震中的地下水水文地球化学特征。结果表明：（1）研究区3个温泉水样的水化学类型、氢氧同位素比值、SiO2浓度均与其他地区的水样存在显着差异，表明温泉水来源于更深的地热储层，经历了更远的运移和更长的分馏过程； （2）震中区部分采样点地下水地球化学特征与其他浅层地下水或地表水样品明显不同，表明震中区地下水环境已受到地震影响。结合震后震中区宏观地下水响应，探讨地震对区域地下水环境的影响机制。我们的结论是，震中到发震断层的距离越短，产生新裂缝的可能性就越大，从而引起地下水的宏观响应和化学特征变化。
Groundwater is undoubtedly important for water security and eco-environmental protection, especially in areas that experience earthquakes. Analyzing the characteristics and variation of groundwater after an earthquake is significant to obtain a better understanding of the seismic risk and rational management of groundwater resources. This study investigated the hydrogeochemical characteristics of groundwater at the epicenter of the 2021 Biru M6.1 earthquake in central Tibet, southwest China, using 23 water samples. The results showed that: (1) the hydrochemical type, hydrogen and oxygen isotope ratios, and SiO2 concentrations of three hot spring water samples in the study area were significantly different from those of samples taken elsewhere, indicating that the hot spring water originates from deeper geothermal reservoirs and has undergone more distant migration and longer fractionation processes; (2) the geochemical characteristics of groundwater from some sampling sites in the epicentral area were apparently distinct from those of other shallow groundwater or surface water samples, suggesting that the groundwater environment in the epicentral area has been affected by the earthquake. Along with the macroscopic groundwater responses in the epicentral area after the earthquake, we investigated the influencing mechanisms of the earthquake on the regional groundwater environment. We conclude that a shorter distance from the epicenter to the seismogenic fault leads to a greater possibility of the generation of new fractures, which then induce macroscopic responses and chemical characteristic variations for groundwater.