Gauss-Newton-CG technique for acoustic-elastic coupled media

초록

We developed a frequency-domain acoustic-elastic coupled waveform inversion based on the Gauss-Newton-CG method. Despite the use of a high-performance computer system and a state-of-the-art parallel-computation algorithm, it is still computationally prohibitive to calculate the approximate Hessian explicitly for a large-scale inverse problem. Accordingly, we adopted the conjugate-gradient-least-squares (CGLS) algorithm, which is frequently used for geophysical inverse problems, to implement the Gauss-Newton method, thus calculating the approximate Hessian implicitly. To verify our algorithm, we applied it to synthetic data generated from the Marmousi-2 model. We also extended our algorithm to the North-East Atlantic to check its applicability to real data. © 2011 Society of Exploration Geophysicists.