Abstract
We incorporate body-wave arrival time and surface-wave dispersion data into a joint inversion for three-dimensional P-wave and S-wave velocity structure of the crust surrounding the site of the San Andreas Fault Observatory at Depth. The contributions of the two data types to the inversion are controlled by the relative weighting of the respective equations. We find that the trade-off between fitting the two data types, controlled by the weighting, defines a clear optimal solution. Varying the weighting away from the optimal point leads to sharp increases in misfit for one data type with only modest reduction in misfit for the other data type. All the acceptable solutions yield structures with similar primary features, but the smaller-scale features change substantially. When there is a lower relative weight on the surface-wave data, it appears that the solution over-fits the body-wave data, leading to a relatively rough V s model, whereas for the optimal weighting, we obtain a relatively smooth model that is able to fit both the body-wave and surface-wave observations adequately.
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Acknowledgments
We thank Yehuda Ben-Zion and Antonio Rovelli for organizing the 40th Workshop of the International School of Geophysics on “Properties and Processes of Crustal Fault Zones” in Erice, Sicily, which motivated the present work. We are grateful to two anonymous reviewers for their constructive comments, which we hope have led to substantial improvement of the manuscript. This research presented here was partly supported by the Chinese government’s executive program for exploring the deep interior beneath the Chinese continent (SinoProbe-02), Natural Science Foundation of China under Grant No. 41274055, and Fundamental Research Funds for the Central Universities (WK2080000053). This research was also supported by DE-NA0001523 from the US Department of Energy.
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Zhang, H., Maceira, M., Roux, P. et al. Joint Inversion of Body-Wave Arrival Times and Surface-Wave Dispersion for Three-Dimensional Seismic Structure Around SAFOD. Pure Appl. Geophys. 171, 3013–3022 (2014). https://doi.org/10.1007/s00024-014-0806-y
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DOI: https://doi.org/10.1007/s00024-014-0806-y