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Time-domain elastic Gauss-Newton full-waveform inversion via matrix-free adjoint-state method
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chen, Ke Sacchi, Mauricio D. |
| Copyright Year | 2018 |
| Abstract | A time-domain matrix-free elastic Gauss-Newton FWI algorithm is formulated based on elastic least-squares reverse time migration (LSRTM) algorithm. The proposed algorithm consists of two loops of iterations: the outer Gauss-Newton nonlinear iterations and the inner conjugate gradient least-squares (CGLS) linear iterations. The Gauss-Newton search direction in each outer FWI iteration is computed using the matrix-free CGLS algorithm. This step is equivalent to apply an elastic LSRTM on data residuals. The CGLS algorithm can be safely used for solving the Gauss-Newton search direction because our discretized numerical versions of elastic Born and RTM operators passed the dot-product test. We use the proposed algorithm to simultaneously invert for Pand S-wave velocities. The density is assumed to be known. The proposed elastic Gauss-Newton FWI generates an improvement on the inverted models when compared to the nonlinear conjugate gradient method based elastic FWI. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.geoconvention.com/uploads/2018abstracts/078_GC2018_Time-domain_elastic_Gauss-Newton_full-waveform_inversion.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
