Deep Earth Imaging – Future Science Platform
We use recorded seismograms at surface to image the subsurface structures across different scales. Seismic full waveform inversion is a state-of-art technique by using the complete recorded waveform information for inverting high-resolution subsurface velocity models. Wave-equation based full waveform inversion is a strong nonlinear problem. The traditional gradient-based linear approach heavily relies on a good starting model. A customized trans-dimensional Markov Chain Monte Carlo software is developed to allow us build pseudo-2D earth velocity model, without replying on the starting model, at the same time, providing uncertainty information. The algorithm is embarrassingly parallelized using MPI and OpenMP, thus is a perfect fit for HPC facilities. We use simulated data for simple and complicated model test. Field data test will be conducted this year.
Area of science
Applied Science, Earth Sciences, Geosciences
Systems used
Magnus
Applications used
Competitive meritThe Challenge
Seismic full waveform inversion is a state-of-art technique by using the complete recorded waveform information for inverting high-resolution subsurface velocity models. Wave-equation based full waveform inversion is a strong nonlinear problem. The traditional gradient-based linear approach heavily relies on a good starting model. Without a good starting model, the inversion may converge to a local minima
The Solution
In this study, we develop a nonlinear inversion approach. A customized trans-dimensional Markov Chain Monte Carlo software is developed to allow us build pseudo-2D earth velocity model, without replying on the starting model, at the same time, providing uncertainty information.
The Outcome
The algorithm is embarrassingly parallelized using MPI and OpenMP, thus is a perfect fit for HPC facilities, such as Magnus at Pawsey. The allocation allows us to run several tests using simulated dataset. We need more allocations in future to run more complicated model test and for field data test.
List of Publications
Bayesian Transdimensional Seismic Full Waveform Inversion with a Dipping Layer Parameterization, Visser, Guo and Saygin, submitted to Geophysics
