Journal
JOURNAL OF APPLIED GEOPHYSICS
Volume 122, Issue -, Pages 167-171Publisher
ELSEVIER
DOI: 10.1016/j.jappgeo.2015.09.019
Keywords
Surface wave; Dispersion image; Resolution; Equivalence
Funding
- National Natural Science Foundation of China (NSFC) [41274142]
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A key step in high-frequency surface-wave methods is to acquire the dispersion properties of surface waves. To pick dispersion curves, surface-wave data is required to be transformed from the time-space (t-x) domain to the frequency-phase velocity (f-v) domain. In constructing accurate multi-mode dispersion curves, it is necessary to generate a reliable and high-resolution image of dispersion energy in the f-v domain. At present, there are five methods available for imaging dispersion energy: the T-p transformation, the f-k transformation, the phase shift, the frequency decomposition and slant stacking, and the high-resolution linear Radon transformation. Among them, resolution of the high-resolution linear Radon transformation is the highest. We proposed a processing step to enhance resolution of the other four methods. Resolution of the four enhanced methods and high-resolution linear Radon transformation is compared by imaging dispersion energy of the same synthetic data. As a result, the four enhanced methods generated dispersion images with the same resolution, which revealed that the resolution of the five dispersion-imaging methods is essentially equivalent for noise-free data. (C) 2015 Elsevier B.V. All rights reserved.
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