Abstract Using wavelet transform, correlation analysis, regression analysis and other methods, we study the characteristics and mechanism of the influence of short-term air pressure disturbance on the extensometer observation at Changshu station in the time-frequency domain. The results show that the influence frequency band is mainly concentrated in 8 to 256 min; the influence of the air pressure below 8 min is weak; the correlation coefficient between extensometer measured values and air pressure and the air pressure influence coefficient of 8 to 32 min have changed from positive to negative; the average value of the correlation coefficient between extensometer measured values and air pressure above 32 min is greater than 0.7, and the air pressure influence coefficient is high and changes relatively smooth. The effect of air pressure on the NS component is about 2.5 to 3 times that of the EW component.Finally, the method of wavelet decomposition and reconstruction is used to effectively eliminate the short-time interference of air pressure.
DI Liang,QIAN Wenjie,LIU Dongdong et al. Analysis on the Influence Frequency Band of the Extensometer at Changshu Station by Short-Term Air Pressure Disturbance[J]. jgg, 2023, 43(12): 1307-1312.
DI Liang,QIAN Wenjie,LIU Dongdong et al. Analysis on the Influence Frequency Band of the Extensometer at Changshu Station by Short-Term Air Pressure Disturbance[J]. jgg, 2023, 43(12): 1307-1312.