气象因素对甘肃临夏台形变观测的影响分析

ANALYSIS ON THE INFLUENCE OF METEOROLOGICAL FACTORS ON THE DEFORMATION OBSERVATION IN LINXIA

分析了气象因素(降雨、温度和气压)对临夏地震台(以下简称临夏台)形变观测的影响。通过对观测资料的质量评定,认为临夏台的CZB-2A型竖直摆钻孔倾斜仪和YRY-4型分量式钻孔应变仪的运行稳定,观测资料可靠。以2017~2019年的观测资料为研究对象,选取降雨比较明显的时段,分析观测资料受影响情况;利用曲线拟合的方法去除资料的趋势变化后,分析温度和气压对观测资料的影响。分析认为降雨对临夏台形变观测资料影响较为明显,钻孔倾斜观测对降雨的响应更快;温度与应变观测呈正相关,温度对应变观测的影响存在时间滞后;气压与应变观测呈负相关,钻孔应变观测曲线变化与气压急剧变化几乎同步,无明显滞后,临夏台钻孔应变观测曲线的趋势性变化是气压和温度共同作用的结果。但温度和气压对临夏台钻孔倾斜的影响较小,没有明显的对应关系。

This paper analyzes the influence of meteorological factors(rainfall,temperature,air pressure)on deformation observation at Linxia station.Through the quality evaluation of the observation data,it is concluded that the CZB-2A tiltmeter and the YRY-4 borehole strain of Linxia station is running stability and the observation data are reliable.The observed data onto 2017 to 2019 were taken as the research object,and the period of obvious rainfall was selected to analyze the influence of the observed data;after removing the trend change of the data by curve fitting,analyze the influence of temperature and air pressure on the observation data.The analysis shows that the rainfall has a more obvious effect on the deformation observation data of Linxia station,and the tiltmeter responds faster to the rainfall;temperature is positively correlated with borehole strain observation.The influence of temperature on borehole strain observation has time lag;air pressure is negatively correlated with borehole strain observations,and the the change of the borehole strain observation is almost synchronized with the rapid change of air pressure without obvious lag.It is that the trend change of the borehole strain observation of Linxia station is the result of the combined action of air pressure and temperature.However,temperature and air pressure have little effect on the tiltmeter of Linxia station,and there is no obvious corresponding relationship.