青岛台体应变短周期气压系数变化原因探讨

青岛台体应变短周期(小于128 min)气压系数2018-01出现阶变,通过对观测系统、台站周边施工情况、监测环境等逐项现场核实,排除观测系统、周边施工的影响。利用离散小波变换和回归分析发现,钻孔水位的气压系数与体应变气压系数同步阶变,结合台站钻孔施工当天体应变钻孔水位变化、体应变趋势变化、其他相邻台站水位气压系数变化等数据认为,台站钻孔施工是导致体应变气压系数变化的原因,并定性分析其变化机理。

Discussion on the Variation of Short-Period Atmospheric Pressure Coefficient of the Volumetric Strain at Qingdao Station

Abstract: The step change of the atmospheric pressure coefficient of Qingdao station in a short period(less than 128 min) occurred in January 2018. Through on-site verification analysis of the observation system, construction situation near the station and observation environment, the two factors of observation system and construction near the station are excluded. Using discrete wavelet transform and regression analysis, the paper finds that the variation of atmospheric pressure coefficient of borehole water level and volumetric strain is synchronous. To determine the reason for the variation of atmospheric pressure coefficient of the volumetric strain, the paper studies the water level variation of volumetric strain borehole on the day of drilling construction, the trend variation of volumetric strain of Qingdao station, and variation of atmospheric pressure coefficient of water level at other adjacent seismic stations. The results show that drilling construction is the cause of variation of atmospheric pressure coefficient of volumetric strain and the change mechanism is qualitatively analyzed.