短周期气压波对青岛台体应变的影响分析

Analysis on the Influence of Short-Period Atmospheric Pressure Wave on Volumetric Strain of Qingdao Station

利用相关分析、回归分析和交叉小波变换等方法,研究青岛台短周期(小于128 min)气压波和体应变的相关系数、气压系数和时频谱。结果表明,影响青岛台体应变的短周期气压波的优势周期为16~128 min。周期小于16 min(高频段)时,相关系数较小,随周期增大而增大;周期大于16 min(低频段)时,相关系数较大,趋于稳定。在相关系数较大且稳定的周期,气压系数为(3.5~3.6)×10 -9 /hPa,其中周期为16~64 min的气压系数随时间波动最小。交叉小波变换能更细致地揭示不同周期气压波和体应变在时频域的相关关系。

The paper studies the correlation coefficient, short-period (less than 128 min) atmospheric pressure coefficient, and time-frequency spectrum of volumetric strain of Qingdao station by correlation analysis, regression analysis and cross wavelet transform. The results show that short-period atmospheric pressure can influence volumetric strain of Qingdao station (between 16 and 128 min). High-frequency correlation coefficients, whose periods are less than 16 min, are small and increase with period. Low-frequency(more than 16 min) correlation coefficients are large and variations are small. Low-frequency (between 16 and 128 min) atmospheric pressure coefficient is (3.5~3.6)× 10 -9 /hPa. When the periods are 16~64 min, the variations with time of atmospheric pressure coefficients are smallest. Cross wavelet transform can reveal the time-frequency spectrum correlation coefficients, which can meticulously study the correlation of atmospheric pressure wave and volumetric strain of different periods.