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.
Suggested Citation
Ivanov, J., Miller, R., Peterie, S., Zeng, C., Xia, J., and Schwenk, T., 2011, Multi-channel analysis of surface waves MASW of models with high shear-wave velocity contrast: SEG Technical Program Expanded Abstracts, v. 30, no. 1, p. 1384-1390, https://doi.org/10.1190/1.3627461.
| 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 |
| Publication Date | August 08, 2011 |
| 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 |