太原基准地震台连续重力数据非潮汐量的获取及背景噪声分析

Non Tidal Volume Acquisition of Continuous Gravity Data and Background Noise Analysis in Taiyuan Reference Seismological Station

以太原基准地震台连续重力观测资料为基础,对原始连续重力数据进行预处理,去除环境和仪器因素造成的突跳、台阶和数据漂移,滤除数据中占主要成分的潮汐分量,并考虑大气负荷效应的影响,得到连续重力非潮汐量。在此基础上,引入HHT时频分析方法,分析台站连续重力数据背景噪声频谱特征,得出背景噪声的能量主要集中在高频段(0.11~0.35 Hz),优势频率为0.25Hz。

Based on the continuous gravity observation data in Taiyuan Reference Seismological Station,the original gravity observation data is preprocessed.It mainly includes removing the abrupt jump,step and data drift caused by environmental and instrumental factors,and filtering out the tidal component of the main component in the gravity observation data,and the influence of atmospheric load effect is also considered to obtain the non tidal volume of continuous gravity.On this basis,the HHT time-frequency analysis method is used to analyze the spectral characteristics of the background noise of continuous gravity observation data.It is concluded that the background noise energy is mainly concentrated in the high frequency band,and the dominant frequency is 0.25 Hz.