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First arrival travel time tomography based on the adjoint state methods

Abstract : Classical algorithms used for traveltime tomography are not necessarily well suited for handling very large seismic data sets or for taking advantage of current supercomputers. The classical approach of first-arrival traveltime tomography was revisited with the proposal of a simple gradient-based approach that avoids ray tracing and estimation of the Fréchet derivative matrix. The key point becomes the derivation of the gradient of the misfit function obtained by the adjoint- state technique. The adjoint-state method is very attractive from a numerical point of view because the associated cost is equivalent to the solution of the forward-modeling problem, whatever the size of the input data and the number of unknown velocity parameters. An application on a 2D synthetic data set demonstrated the ability of the algorithm to image near-surface velocities with strong vertical and lateral variations and revealed the potential of the method.
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Contributor : Mark Noble Connect in order to contact the contributor
Submitted on : Monday, September 20, 2010 - 1:03:35 PM
Last modification on : Wednesday, October 14, 2020 - 3:56:38 AM

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  • HAL Id : hal-00519453, version 1
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Cédric Taillandier, Mark Noble, Hervé Chauris, Henri Calandra. First arrival travel time tomography based on the adjoint state methods. Geophysics, Society of Exploration Geophysicists, 2009, 74 (6), pp.WCB57-WCB66. ⟨hal-00519453⟩

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