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 linear least square inversion. Simulated annealing was implemented to obtain a velocity model that can be used as initial guess for linear least square inversion. Linear Traveltime Interpolation raytracing approximation is used to trace rays and calculate traveltimes. The procedure is tested both for a synthetic model and a real case. The real case comes from a previous study, that was solved by linear least square inversion. In both synthetic and real cases comparison is performed between the linear least square inversion results and hybrid approach; in the field study we compare the old results with those inferred by sequential approach.


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