期刊
JOURNAL OF APPLIED GEOPHYSICS
卷 119, 期 -, 页码 156-169出版社
ELSEVIER
DOI: 10.1016/j.jappgeo.2015.05.018
关键词
3D MASW technique; Centroid-of-acquisition-geometry assumption; Rayleigh-wave propagation; 3D topographic free surface
资金
- China Postdoctoral Science Foundation [2013M542087]
- Open Foundation of Hubei Subsurface Multi-scale Imaging Key Lab (SMIL), China University of Geosciences (Wuhan) [SMIL-2014-08]
- National Natural Science Foundation of China [40974079]
Multichannel analysis of surface wave (MASW) method is an efficient tool to obtain near-surface S-wave velocity, and it has gained popularity in engineering practice. Up to now, most examples of using the MASW technique are focused on 2D models or data from a 1D linear receiver spread. We propose a 3D MASW scheme. A finite-difference (FD) method is used to investigate the method using linear and fan-shaped receiver spreads. Results show that the 3D topography strongly affects propagation of Rayleigh waves. The energy concentration of dispersion image is distorted and bifurcated because of the influence of free-surface topography. These effects are reduced with the 3D MASW method. Lastly we investigate the relation between the array size and the resolution of dispersion measurement. (C) 2015 Elsevier B.V. All rights reserved.
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