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The inverse medium problem in site characterization

Friday, October 19, 3PM – 4PM
POB 6.304

Loukas F. Kallivokas

I discuss recent progress in the full-waveform-based imaging of probed soils, with geotechnical site characterization applications in mind. The driving problem is similar to geophysical probing, albeit here the focus is in the characterization of the near-surface deposits. I discuss the two key ingredients of the problem: a. modeling of the forward problem, which involves the numerical simulation of wave propagation in PML (perfectly-matched-layer)-truncated domains in the time-domain (I'll provide a brief overview of PML developments to date); and b. the inverse medium problem and the schemes we have implemented in an attempt to lend robustness to the inversion process. I'll report numerical experiments with synthetic data involving the acoustic and elastic Marmousi benchmark problems, as well as numerical results driven by actual field data.

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