滇西北构造地热特征及对地震活动的影响  

Tectonic geothermal feature of Northwest Yunnan and the influence on seismic activity

作　　者：王博 周永胜[1] 钟骏[2] 王月 解孟雨 王云 胡小静[3] 张翔[3] WANG Bo;ZHOU YongSheng;ZHONG Jun;WANG Yue;XIE MengYu;WANG Yun;HU XiaoJing;ZHANG Xiang(State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China;China Earthquake Networks Center,Beijing 100045,China;Earthquake Administration of Yunnan Province,Kunming 650224,China)

机构地区：[1]中国地震局地质研究所,地震动力学国家重点实验室,北京100029 [2]中国地震台网中心,北京100045 [3]云南省地震局,昆明650224

出　　处：《地球物理学报》2022年第9期3419-3433,共15页Chinese Journal of Geophysics

基　　金：中国地震局地震科技星火计划项目(XH19055和XH21046Y);国家重点研发计划(2018YFE0109700)联合资助。

摘　　要：温泉的水化学组分、循环路径和构造地热特征是分析活动断裂中流体耦合机制及讨论流体对地震发生影响的有效约束之一.本文通过对滇西北地区多条活动断裂附近的温泉资料进行收集,应用硅-焓模型估算了该区域温泉的热储温度,对温泉的出露温度、离子组分、热储温度、循环深度及同位素组成特征(δD和δ^(18)O)等进行了分析.首先对区域内的地震进行了重定位分析,讨论了小震震源深度与热储温度的关系,而后分析了该区域的b值特征,论述了以热储温度表示的区域浅层地热特征与地震活动的关系.结果表明2021年5月21日云南漾濞6.4级地震发生在浅层地温场高值区与低值区转换的地热温度梯度异常区内.The hydrochemistry composition and circulation path,and tectonic geothermal characteristics of hot springs are one of the effective methods to analyze the fluid coupling mechanism in active fractures and to discuss the effects of fluid on earthquakes.This paper estimates the geothermal reservoir temperature using the silicon-enthalpy model.Exposed temperature,hydrochemistry composition,geothermal reservoir tepmperature,circulation depth,and isotope composition(δD andδ^(18)O)of hot springs are analyzed in several active faults in northwest Yunnan.The precise relocation of earthquakes in the study area is conducted,and the relationship between earthquakes'focal depth and hot springs'geothermal reservoir temperatures is considered.The b-value is calculated,and the correlation between shallow geothermal characteristics and seismic activity in the region is discussed.The Yangbi M6.4 earthquake on May 21,2021,occurred in the transitional geothermal gradient zone(from a high value to a low value)of the shallow geothermal field.

关 键 词：滇西北 热储温度 硅-焓模型 震源深度 漾濞地震 

分 类 号：P314[天文地球—固体地球物理学] P315[天文地球—地球物理学]