Multi-channel analysis of surface waves MASW of models with high shear-wave velocity contrast
SEG Technical Program Expanded Abstracts
By: J. Ivanov, R. D. Miller, S. Peterie, C. Zeng, J. Xia, and T. Schwenk
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Abstract
We use the multi-channel analysis of surface waves MASW method to analyze synthetic seismic data calculated using models with high shear-wave velocity Vs contrast. The MASW dispersion-curve images of the Rayleigh wave are obtained using various sets of source-offset and spread-size configurations from the synthetic seismic data and compared with the theoretically calculated fundamental- and higher-mode dispersion-curves. Such tests showed that most of the dispersion-curve images are dominated by higher-mode energy at the low frequencies, especially when analyzing data from long receiver offsets and thus significantly divert from numerically expected dispersion-curve trends, which can lead to significant Vs overestimation. Further analysis showed that using data with relatively short spread lengths and source offsets can image the desired fundamental-mode of the Rayleigh wave that matches the numerically expected dispersion-curve pattern. As a result, it was concluded that it might be possible to avoid higher-mode contamination at low frequencies at sites with high Vs contrast by appropriate selection of spread size and seismic source offset. ?? 2011 Society of Exploration Geophysicists.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Multi-channel analysis of surface waves MASW of models with high shear-wave velocity contrast |
| Series title | SEG Technical Program Expanded Abstracts |
| DOI | 10.1190/1.3627461 |
| Volume | 30 |
| Issue | 1 |
| Year Published | 2011 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | SEG Technical Program Expanded Abstracts |
| First page | 1384 |
| Last page | 1390 |
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