Synthetic data results demonstrate the effectiveness of reconstructing both the high- and low-wavenumber features in the model without relying on diving waves in the inversion. After that, if necessary, navigate to the folder where the RES2DINV program is installed. A multiscale approach is used where higher frequencies are down-weighted significantly at early iterations, and gradually included in the inversion. Click the 'File' choice, followed by the Read data file menu choice. The forward and adjoint operators are implemented in the space-time domain to simultaneously invert the data over a range of frequencies. With this method, model updating along deep reflection wavepaths are automatically enhanced, which in turn improves imaging below the reach of diving-waves. The newton per weber (or ampere per metre) is a much smaller unit than the oersted: 1 N/Wb 1 A/m 4 x 10-3 oersted, or 1 oersted 79.7 N/Wb 79.7 A/m. By Abdullah AlTheyab, Xin Wang and Gerard T.
#Incomplete gauss newton inversion res2dinv update#
In our application, iterative least-squares reverse-time migration (LSRTM) is used to estimate the model update at each non-linear iteration, and the number of LSRTM iterations is progressively increased after each non-linear iteration. The ampere per metre is more widely used than the newton per weber, but the quantity measured is numerically the same, whichever name is used for the unit. Time-domain incomplete Gauss-Newton full-waveform inversion of Gulf of Mexico data. We apply the incomplete Gauss-Newton full-waveform inversion (TDIGN-FWI) to Gulf of Mexico (GOM) data in the space-time domain.
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