Rapid least-squares inversion of apparent resistivity pseudosections by M. H. Loke, R. D. Barker.

*A fast iterative inversion technique for the interpretation of data from resistivity imaging surveys using a microcomputer has been developed. This is based on smoothness-constrained least-squares method and it produces two-dimensional subsurface model directly apparent pseudosection. The completely automatic does not even require user to supply starting model. In initial iteration, homogeneous earth used as which partial derivative values can be calculated analytically. For subsequent iterations, quasi-Newton (Broyden, 1965) estimate derivatives. By avoiding direct calculation derivatives, computer time memory space required by finite-difference calculate reduced about eight ten times respectively. taken solve system normal equations also matrix updating techniques associated with (Golub van Loan, 1989). Overall, this faster than conventional Gauss-Newton method. *

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