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Simultaneous measurement and inversion of surface wave dispersion and attenuation curves |
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| Authors: | Carlo G. Lai Glenn J. Rix Sebastiano Foti Vitantonio Roma |
| Affiliation: | a Studio Geotecnico Italiano, Via Ripamonti 89, Milano, Italy b School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA c Centre for Offshore Foundation Systems, University of Western Australia, Crawley, WA 6009, Australia d Geodata, Spa, C.so Duca degli Abruzzi 48/E, Torino, Italy |
| Abstract: | Surface wave tests are non-invasive seismic techniques that have traditionally been used to determine the shear wave velocity (i.e. shear modulus) profile of soil deposits and pavement systems. Recently, Rix et al. [J. Geotech. Geoenviron. Engng 126 (2000) 472] developed a procedure to obtain near-surface values of material damping ratio from measurements of the spatial attenuation of Rayleigh waves. To date, however, the shear wave velocity and shear damping ratio profiles have been determined separately. This practice neglects the coupling between surface wave phase velocity and attenuation that arises from material dispersion in dissipative media. This paper presents a procedure to measure and invert surface wave dispersion and attenuation data simultaneously and, thus, account for the close coupling between the two quantities. The methodology also introduces consistency between phase velocity and attenuation measurements by using the same experimental configuration for both. The new approach has been applied at a site in Memphis, TN and the results obtained are compared with independent measurements. |
| Keywords: | Surface waves Rayleigh waves Dispersion Attenuation Spectral analysis of surface waves Shear wave velocity Shear damping ratio Simultaneous measurement Simultaneous inversion |
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