| Abstract: | A cutoff defines the long-period termination of a Rayleigh-wave higher mode and, therefore is a key characteristic of higher mode energy relationship to several material properties of the subsurface. Cutoffs have been used to estimate the shear-wave velocity of an underlying half space of a layered earth model. In this study, we describe a method that replaces the multilayer earth model with a single surface layer overlying the half-space model, accomplished by harmonic averaging of velocities and arithmetic averaging of densities. Using numerical comparisons with theoretical models validates the single-layer approximation. Accuracy of this single-layer approximation is best defined by values of the calculated error in the frequency and phase velocity estimate at a cutoff. Our proposed method is intuitively explained using ray theory. Numerical results indicate that a cutoffs frequency is controlled by the averaged elastic properties within the passing depth of Rayleigh waves and the shear-wave velocity of the underlying half space. ?? Birkh??user Verlag, Basel 2009. |
| Genre: | Article |
| ProdID: | 70036006 |
| Citation Author: | Xu, Y.; Xia, J.; Miller, R. D. |
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| Citation End Page: | 351 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Pure and Applied Geophysics |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Approximation to cutoffs of higher modes of Rayleigh waves for a layered earth model; 2009; Article; Journal; Pure and Applied Geophysics; Xu, Y.; Xia, J.; Miller, R. D. |
| Citation Start Page: | 339 |
| Citation Volume: | 166 |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Approximation to cutoffs of higher modes of Rayleigh waves for a layered earth model; 2009; Article; Journal; Pure and Applied Geophysics; Xu, Y.; Xia, J.; Miller, R. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1007/s00024-008-0443-4 |
| Date Other: | Thu, 1 Jan 2009 00:00 -0600 |
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