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Matrix probing: a randomized preconditioner for the wave-equation Hessian
[article]
2011
arXiv
pre-print
This paper considers the problem of approximating the inverse of the wave-equation Hessian, also called normal operator, in seismology and other types of wave-based imaging. An expansion scheme for the pseudodifferential symbol of the inverse Hessian is set up. The coefficients in this expansion are found via least-squares fitting from a certain number of applications of the normal operator on adequate randomized trial functions built in curvelet space. It is found that the number of parameters
arXiv:1101.3615v1
fatcat:gtcqxhp4x5htnec2b6gmozitge