| Abstract: | The shear-wave (S-wave) velocity of near-surface materials (soil, rocks, pavement) and its effect on seismic-wave propagation are of fundamental interest in many groundwater, engineering, and environmental studies. Rayleigh-wave phase velocity of a layered-earth model is a function of frequency and four groups of earth properties: P-wave velocity, S-wave velocity, density, and thickness of layers. Analysis of the Jacobian matrix provides a measure of dispersion-curve sensitivity to earth properties. S-wave velocities are the dominant influence on a dispersion curve in a high-frequency range (>5 Hz) followed by layer thickness. An iterative solution technique to the weighted equation proved very effective in the high-frequency range when using the Levenberg-Marquardt and singular-value decomposition techniques. Convergence of the weighted solution is guaranteed through selection of the damping factor using the Levenberg-Marquardt method. Synthetic examples demonstrated calculation efficiency and stability of inverse procedures. We verify our method using borehole S-wave velocity measurements.Iterative solutions to the weighted equation by the Levenberg-Marquardt and singular-value decomposition techniques are derived to estimate near-surface shear-wave velocity. Synthetic and real examples demonstrate the calculation efficiency and stability of the inverse procedure. The inverse results of the real example are verified by borehole S-wave velocity measurements. |
| Genre: | Article |
| ProdID: | 70021669 |
| Citation Author: | Xia, J.; Miller, R. D.; Park, C. B. |
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| Citation End Page: | 700 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysics |
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| Citation Number Of Pages: | 10 |
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| Citation Publisher: | Soc of Exploration Geophysicists |
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| Citation Search Results Text: | Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves; 1999; Article; Journal; Geophysics; Xia, J.; Miller, R. D.; Park, C. B. |
| Citation Start Page: | 691 |
| Citation Volume: | 64 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Estimation of near-surface shear-wave velocity by inversion of Rayleigh waves; 1999; Article; Journal; Geophysics; Xia, J.; Miller, R. D.; Park, C. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
| Publisher: | Soc of Exploration Geophysicists |
