易门井水温动态特征及其成因分析

DYNAMIC CHARACTERISTICS OF WATERRTEMPERATURE FORYIMENWELL AND CAUSE ANALYSIS

以易门井近30年以来的水温观测资料为研究对象,系统收集整理了水温观测过程中记录到的各种干扰因素,对易门井水温动态变化特征及其形成机制进行了总结,对水温映震效能进行了分析。结果认为易门井水温日变形态为起伏型,日变幅差呈现逐年减小的趋势,水温多年趋势动态为小幅振荡缓慢上升型走势。场地环境干扰对易门井水温的影响较小,主要干扰因素为观测系统故障、人为干扰。水温观测系统故障主要是仪器故障和供电故障,表现形式以下降、缺数为主;人为干扰主要是安装、校测仪器和取样,表现形式为短时“V”字型或台阶变化。易门井水温在小幅振荡上升过程中若出现转向或加速,这种变化可能是邻区构造活动引起的。易门井水温同震变化表现形态为快速下降—缓慢回升的过程。

The water temperature observation data of Yimen Well over the past 30 years is taken as the research object,and various interference factors recorded during the water temperature observation are systematically collected and organized.The reflecting earthquake ability of water temperature of Yimen Well is analyzed,and the dynamic change characteristics of water temperature and the formation mechanism are summarized.The results show that the daily variation of water temperature of Yimen Well is fluctuating,and the difference in daily variation shows a trend of decreasing year by year,and the dynamic trend of water temperature over the years is a small-oscillation and slow-ascending trend;the environmental interference factors of the site for the water temperature of Yimen Well are small,and the main interference factors for the water temperature are observation system faults and human interference.The water temperature observation system faults are mainly instrument faults and power supply faults,manifested in the form of declining and missing data.The human interference mainly involves instalation,calibration of instruments,and sampling,manifested in short-time"y"shape or step change;If the water temperature in the Yimen County well turns or accelerates during the rise of the small amplitude oscillation,the change may be caused by the tectonic activity in the adjacent area;the co-seismic variation of the water temperature of Yimen Well shows a rapid-declining and slow-rising process.