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

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.