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DTSTAMP:20220812T074334Z
LOCATION:Singapore Room
DTSTART;TZID=Europe/Stockholm:20220627T170000
DTEND;TZID=Europe/Stockholm:20220627T173000
UID:submissions.pasc-conference.org_PASC22_sess147_msa124@linklings.com
SUMMARY:Adjoint Waveform Tomography with Salvus: Application to Continenta
 l- and Reservoir-Scale Seismic Structure
DESCRIPTION:Minisymposium\n\nAdjoint Waveform Tomography with Salvus: Appl
 ication to Continental- and Reservoir-Scale Seismic Structure\n\nRodgers, 
 Morency, Krischer, Afanasiev, Boehm...\n\nWe report on seismic Earth model
 s obtained with Adjoint Waveform Tomography using Salvus. Salvus is a soft
 ware package for managing the data and computationally intensive workflow 
 for seismic waveform inversion using adjoint methods. These methods use fu
 lly three-dimensional forward and adjoint simulations to compute waveforms
  and sensitivity kernels in an iterative non-linear optimization algorithm
 . We are applying Salvus to two study areas. Firstly, we inverted broadban
 d waveforms for radially anisotropic structure of the Western United State
 s. This involved 256 iterations and fit waveforms in the period range 20-1
 20 seconds. Results reveal details of sub-surface structure and greatly im
 prove waveform fits for an independent set of validation data. We are also
  working on a reservoir-scale study of the Bradys Geothermal Area with a d
 ata set collected during the POROTOMO project. These data include dense re
 cordings of vibroseis active-sources. The analysis requires significant ma
 nipulation of the data to estimate impulse responses of sweep point forces
 . The data are inverted using a novel optimal transport misfit objective f
 unction and treatments of the event kernels to isolate model updates. Resu
 lts indicate that structure can be inferred from the data and we are explo
 ring time-dependence of inferred structure during different phases of rese
 rvoir operations.\n\nDomain: Climate, Weather and Earth Sciences, Computer
  Science and Applied Mathematics, Physics
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