Surface-wave dispersion measurements using Hilbert-Huang transform
Resource
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,13(2),171-184.
Journal
Terrestrial Atmospheric and Oceanic Sciences
Pages
171
Date Issued
2002-06
Date
2002-06
Author(s)
Chen, CH
Li, CP
Teng, TL
Abstract
An efficient procedure using the Hilbert-Huang transform (HHT) method for the determination of the dispersion curves of seismic surface waves is investigated in this study. The HHT method is compared with a Fourier-based time-frequency analysis in the extraction of dispersion data from a synthetic seismic waveform generated by a point source in a layered medium. The HHT method provides high-resolution measurement of the spectral content as a function of arrival time, and the dispersion curve of group velocity is determined more accurately than that derived using con ventional Fourier-based frequency-time analysis. Using a simple polyno mial fitting technique, the dispersion curve of the phase velocity can also be derived by integrating the dispersion curve of the group velocity. Numeri cal tests show that the HHT method is capable of mapping the energy dis tribution in the frequency-time domain accurately, and the procedure re quires much less computer time than other methods for surface-wave dis persion analysis.
SDGs
Type
journal article