Rayleigh-Wave Dispersive Energy Imaging Using a High-Resolution Linear Radon Transform |
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Authors: | Yinhe Luo Jianghai Xia Richard D Miller Yixian Xu Jiangping Liu Qingsheng Liu |
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Institution: | (1) Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, 430074, China;(2) Kansas Geological Survey, The University of Kansas, 1930 Constant Avenue, Lawrence, Kansas 66047-3724, USA;(3) State Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, 430074, China |
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Abstract: | Multichannel Analysis of Surface Waves (MASW) analysis is an efficient tool to obtain the vertical shear-wave profile. One
of the key steps in the MASW method is to generate an image of dispersive energy in the frequency-velocity domain, so dispersion
curves can be determined by picking peaks of dispersion energy. In this paper, we propose to image Rayleigh-wave dispersive
energy by high-resolution linear Radon transform (LRT). The shot gather is first transformed along the time direction to the
frequency domain and then the Rayleigh-wave dispersive energy can be imaged by high-resolution LRT using a weighted preconditioned
conjugate gradient algorithm. Synthetic data with a set of linear events are presented to show the process of generating dispersive
energy. Results of synthetic and real-world examples demonstrate that, compared with the slant stacking algorithm, high-resolution
LRT can improve the resolution of images of dispersion energy by more than 50%. |
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Keywords: | MASW Rayleigh-wave dispersive energy high-resolution linear Radon transform conjugate gradient |
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