用高台宽频带数字资料研究气流扰动对地脉动的干扰影响
Research on Influence by the Air Disturbance in Microtremor Recordings based on the Broad-band Digital Data of Gaotai Station

通过对高台宽频带数字资料在数次冷空气过程时段地脉动幅度及频谱变化的分析，在时间域和频率域上研究冷空气过程的干扰特征，发现冷空气过程时段，地脉动记录曲线会出现大周期扰动或抖动式畸变；随着冷空气过程开始到结束，0.001~0.005 Hz的频幅最大值出现较大变化，进程上具有上升、达到最大值、逐渐回复的特征，降温幅度最大则扰动幅度达到最高值。
Through many studies on the changes of the amplitude and the spectrum of microtremors in the period of cold air process in the digital broadband date from Gaotai. We also researches on the process of cold air disturbance to the microtremors in time-domain and frequency-domain. Then we discovered that in the process of cold air, the microtremors curve will be a big periodic perturbation or jitter distortion. the process with the cold air from start to finish, the 0.001~0.005 Hz amplitude-frequency value changed greatly,and the process had the characteristic of rapid increase-reach to maximum-dicrease then return to the normal, and the maximum disturbance data will happen at the time of maximum temperature decrease.