黄梅台宽频带倾斜仪记录的台风扰动特征分析

Analysis of typhoon disturbance characteristics recorded by broadband tiltmeter at Huangmei station

利用黄梅台VP宽频带垂直摆倾斜仪在台风“巴威”(BAVI)和“烟花”(IN-FA)经过期间记录的连续观测资料,通过小波分解和傅里叶变换,分析台风引起的地脉动信号的扰动特征和频谱特性。结果表明:台风扰动幅度随着台风进程呈现出上升—峰值—下降的规律,与台风风速、台风中心与台站距离有良好的相关性;台风引起的地脉动信号的优势频率范围为0.13—0.3 Hz,对应周期为3.3—7.7 s。

The continuous observation data recorded by broadband vertical pendulum tiltmeter at Huangmei station during the typhoons“BAVI”and“IN-FA”were studied.Wavelet decomposition and Fourier transform were used to investigate the disturbance and spectrum characteristics of the microseism signal which caused by the typhoons.The results show that the disturbance amplitude has an increase-peak-decrease pattern during the process of typhoons,and has a good correlation with the wind speed of typhoons,the distance between the typhoon center and the station.The dominant frequency range of the microseism caused by the typhoons is from 0.13 to 0.3 Hz,with the corresponding period of 3.3 to 7.7 s.