Inversion of Seismic Surface Wave Data to Resolve Complex Profiles

For a complex layered site, development of a shear wave velocity profile from inversion of seismic surface wave data can yield nonunique results. One class of solutions provides depth-averaged profiles that are useful but do not detail the local velocity anomalies. Simulated annealing inversion can be used to establish whether nonuniqueness is a concern for a particular case and, if so, focus results to allow a solution that is expected based on independent knowledge of site conditions. A two-step process is recommended whereby the model parameters are first optimized using simulated annealing and then fine tuned by unconstrained linearized inversion. The process also yields useful confidence measures. One example of a complex layered site where the proposed procedure is helpful is a desert profile with high-velocity cemented layers interspersed among uncemented sediments.

[1]  B. Luke,et al.  A Scheme To Generate Starting Models For Interpretation Of Shallow Surface Wave Data , 2002 .

[2]  R. Pratt,et al.  Reflection waveform inversion using local descent methods: Estimating attenuation and velocity over a gas-sand deposit , 2001 .

[3]  Richard D. Miller,et al.  Multichannel analysis of surface waves , 1999 .

[4]  Prem V. Sharma.  Environmental and Engineering Geophysics by Prem V. Sharma , 1997 .

[5]  R. Gerhard Pratt,et al.  Efficient waveform inversion and imaging: A strategy for selecting temporal frequencies , 2004 .

[6]  W. Menke.  Geophysical data analysis : discrete inverse theory , 1984 .

[7]  Donald P. Coduto,et al.  Foundation Design: Principles and Practices , 2000 .

[8]  Nils Ryden,et al.  Multimodal approach to seismic pavement testing , 2004 .

[9]  Jianghai Xia,et al.  Estimation of near‐surface shear‐wave velocity by inversion of Rayleigh waves , 1999 .

[10]  D. Schmitt,et al.  Simulated annealing inversion of multimode Rayleigh wave dispersion curves for geological structure , 2002 .

[11]  R. Wiggins,et al.  The general linear inverse problem - Implication of surface waves and free oscillations for earth structure. , 1972 .

[12]  B. Sundquist.  Evaluation of geophysical methods to characterize alluvial soils in the arid environment , 2001 .

[13]  B. Luke,et al.  Non-Uniqueness In Inversion Of Seismic Surface-Wave Data , 2003 .

[14]  Henrik Schmidt,et al.  A full wave solution for propagation in multilayered viscoelastic media with application to Gaussian beam reflection at fluid–solid interfaces , 1985 .

[15]  K. Stokoe,et al.  Comparison of 2-D and 3-D models for analysis of surface wave tests , 1991 .

[16]  D. L. Weide,et al.  Soils and Quaternary geology of the southwestern United States , 1985 .

[17]  Nenad Gucunski,et al.  Numerical simulation of the SASW test , 1992 .

[18]  John N. Louie,et al.  Faster, Better: Shear-Wave Velocity to 100 Meters Depth From Refraction Microtremor Arrays , 2001 .

[19]  M. Machette.  Calcic soils of the southwestern United States , 1985 .

[20]  J. M. Roesset,et al.  Characterization of geotechical sites by SASW method , 1994 .

[21]  Mrinal K. Sen,et al.  Global Optimization Methods in Geophysical Inversion , 1995 .

[22]  Some notes on model parameters for surface wave data inversion , 2002 .

[23]  Mrinal K. Sen,et al.  Nonlinear one-dimensional seismic waveform inversion using simulated annealing , 1991 .