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WyCEHG’s geophysical modeling team will develop new methods for inverting geophysical data to determine subsurface properties. In particular, full exploitation of shallow geophysical data poses two computational challenges. First, the combination of different imaging modalities via data-intensive computing is needed to provide a complete image of the subsurface. Joint inversion schemes for electrical, electromagnetic, microgravity, and seismic data need to be developed, tested, and applied to field data in 3D to properly integrate different measurements sensitive to different physical properties. Second, better resolution through tomographic inversions must be achieved with computer-intensive full-waveform inversion approaches developed for, and conducted using, the NWSC. We will tackle both of these challenges.