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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

46

期数:

2023年01期

页码:

37-48

栏目:

地震地下流体监测预报理论及技术应用专栏

出版日期:

2023-01-01

文章信息/Info

Title:

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

作者:

欧阳澍培¹; 周晓成¹; 何 苗¹; 天 娇¹; 李静超¹; 董金元¹; 李 营¹; 颜玉聪¹; 刘峰立¹; 姚炳宇¹; 王昱文¹; 曾召君¹; 陈曲菲²; 罗志鑫¹; 吉庚凤¹

(1.中国地震局地震预测研究所 高压物理与地震科技联合实验室,北京 100036; 2.新疆维吾尔自治区消防救援总队 乌鲁木齐市消防救援支队经济技术开发区大队,新疆 乌鲁木齐 830009)

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)

关键词:

温泉;  水文地球化学;  前兆异常;  宁洱—通关火山区

Keywords:

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

分类号:

P315.724

DOI:

10.20015/j.cnki.ISSN1000-0666.2023.0005

摘要:

温泉水文地球化学监测可以提供很好的地震短临前兆异常信息。通过采集云南宁洱—通关火山区8个温泉出露点的水样进行水化分析,研究了温泉水文地球化学变化与地震的关系。结果表明:①通关火山温泉有6种水化类型,分别是Na?Ca-HCO₃、Na?Cl-HCO₃、Na-HCO₃、Ca-HCO₃、Na?Ca-SO₄?HCO₃和Na?Ca-Cl?SO₄型。② δ¹⁸O和δD值分别为12.69%～-10.80‰和-89.2%～-81.5‰,表明研究区温泉水主要补给来源是大气降水,补给高程为2.0～2.7 km。③温泉的热储温度在81.7℃～86.3℃,热循环深度为1.1～1.3 km,其热源主要是地热增温及岩浆热。④ 2020年云南绿春M_L4.4地震前,清平热水塘和西萨温泉的Na⁺、Cl^-、SO^2-₄浓度均出现不同幅度的升高; 2021年双柏M_S5.2地震前,清平、西萨、厄里3个连续监测点的Na⁺、Cl^-、SO^2-₄短临前兆异常响应较为明显,表现为震前5～10 d离子浓度异常升高,震后离子浓度降低至平均值上下波动。⑤短临前兆异常主要原因是震前区域构造应力场发生了变化,断裂带裂隙通透性改变,岩层渗透率增加,断裂带内的水循环发生变化,原有的水-岩反应平衡状态改变,温泉水各组分含量相应发生了变化。 关键词:温泉; 水文地球化学; 前兆异常; 宁洱—通关火山区

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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备注/Memo

备注/Memo:

收稿日期:2022-03-30.
基金项目:国家重点研发计划(2017YFC1500501-05,2019YFC1509203)、国家自然科学基金面上项目(41673106,42073063,4193000170)和中国地震局地震预测研究所基本科研业务费(2021IEF0101,2021IEF1201)联合资助.
第一作者简介:欧阳澍培(1997-),硕士研究生在读,主要从事地震流体地球化学研究.E-mail:ouyangshupei888@163.com.
通讯作者简介:周晓成(1978-),研究员,主要从事构造地球化学、流体地球化学研究.E-mail:zhouxiaocheng188@163.com.

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