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Hybrid approach for travel‐time seismic tomography in elliptical anisotropic media
- Source: Near Surface Geophysics, Volume 13, Issue 5, Jun 2015, p. 467 - 476
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- 01 Sep 2014
- 01 May 2015
- 01 May 2015
Abstract
A hybrid approach for seismic travel‐time tomography is proposed in the case of elliptical anisotropic media. A sequential scheme is presented that combines simulating annealing with linearized least squares inversion. At first, simulated annealing is implemented to obtain a velocity model that can be used as initial guess for successive linearized least squares inversion; in the meantime, linear travel‐time interpolation is diffusely used to trace ray paths and calculate travel times. The procedure was tested both for a synthetic model and a field study. Since the field study come from a previous study, uniquely solved by linearized least squares inversion without suggestions for initial guess of the velocity model, we were interested in evaluating upgrades from the hybrid approach compared with solutions coming from a single technique. We found the hybrid approach able to individuate a better velocity model with respect to a “single technique” approach, but as the improvement was slight despite the big amount of computation time needed by simulated annealing, we had also an indirect validation of the previous results of the field study.