Signal reconstruction of surface waves on SASW measurement using Gaussian Derivative wavelet transform |
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Authors: | Sri Atmaja P Rosyidi Mohd Raihan Taha Zamri Chik Amiruddin Ismail |
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Institution: | 1.Department of Civil Engineering,Muhammadiyah University of Yogyakarta,Yogyakarta,Indonesia;2.Department of Civil and Structural Engineering,Universiti Kebangsaan Malaysia,Bangi,Malaysia |
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Abstract: | Surface wave method consists of measurement and processing of the dispersive Rayleigh waves recorded from two or more vertical
transducers. The dispersive phase data are inverted and the shear wave velocity versus depth is obtained. However, in case of residual soil, the reliable phase spectrum curve is difficult to be produced. Noises
from nature and other human-made sources disturb the generated surface wave data. In this paper, a continuous wavelet transform
based on mother wavelet of Gaussian Derivative was used to analyze seismic waves in different frequency and time. Time-frequency
wavelet spectrum was employed to localize the interested seismic response spectrum of generated surface waves. It can also
distinguish the fundamental mode of the surface wave from the higher modes of reflected body waves. The results presented
in this paper showed that the wavelet analysis is able to determine reliable surface wave spectrum of sandy clayey residual
soil. |
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