同井不同层位水温观测同震变化机理分析  

Coseismic change mechanism of water temperature observation at different layers of well

作　　者：周洋 王俊 林俊 ZHOU Yang;WANG Jun;LIN Jun(Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Hubei Earthquake Agency, Wuhan 430071, Hubei, China;School of Computer Science, South-Central University for Nationalities, Wuhan 430071, Hubei, China)

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),湖北武汉430071 [2]湖北省地震局,湖北武汉430071 [3]中南民族大学计算机科学学院,湖北武汉430071

出　　处：《地震工程学报》2022年第3期611-620,共10页China Earthquake Engineering Journal

基　　金：湖北省自然科学基金项目(2019CFB815);中央高校基本科研业务费专项资金项目(CZT20015);中国地震局地震研究所和地壳应力研究所基本科研业务费专项资助项目(6292-6)。

摘　　要：不同水温观测点由于观测环境、井孔条件、观测部位构造条件、介质条件、地下水动力条件的差异,使得水温动态呈现出不同的形态。而同一观测井内不同层位的水温由于水温传感器安置深度和井孔热源分布状态的不同,会出现不同的同震响应形态。利用小波变换算法,分析了房县三海村井不同深度的水温在3次地震中的同震响应变化,并结合该井的温度梯度、围岩特性以及含水层分布,提出一个简单的井-含水层模型。进而探讨了同井不同层位水温出现不同变化的动力学机制,初步认为其动力学机制源于水的流动产生的热对流引起的变化。The dynamic characteristics of water temperature at different observation points are various due to the difference in observation environment,wellbore conditions,structural conditions of observation site,medium conditions,and ground hydrodynamic conditions.The water temperature at different layers of the same observation well often show different co-seismic responses due to the difference in the installation depth of water temperature sensor and the distribution of wellbore heat source.In this paper,the wavelet transform algorithm was used to analyze the co-seismic response changes of water temperature at different depths of the well in Sanhai Village,Fangxian County during three earthquakes.Combined with the well temperature gradient,the surrounding rock characteristics,and the aquifers distribution,a simple well-aquifer model was proposed.Furthermore,the dynamic mechanism of different changes in water temperature at different layers of the same well was discussed,and it is preliminarily believed that the dynamic mechanism is derived from the change caused by thermal convection from water flow.

关 键 词：提升小波变换算法 同震响应 温度梯度 井-含水层模型 水动力学 

分 类 号：P315[天文地球—地震学]