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BEGIN:VEVENT
DTSTAMP:20210916T132454Z
LOCATION:Louis Favre
DTSTART;TZID=Europe/Stockholm:20210709T143000
DTEND;TZID=Europe/Stockholm:20210709T150000
UID:submissions.pasc-conference.org_PASC21_sess134_msa275@linklings.com
SUMMARY:An Automated Workflow for Regional and Reservoir Scale Adjoint Tom
 ography Using Salvus
DESCRIPTION:Minisymposium\n\nAn Automated Workflow for Regional and Reserv
 oir Scale Adjoint Tomography Using Salvus\n\nMorency, Rodgers, Chiang, Mat
 zel, Simmons...\n\nWe use the public dataset of a dense seismic array depl
 oyed for active source tomography at the Brady Hot Springs geothermal site
  in Nevada collected for shallow geothermal reservoir monitoring. This dat
 aset involves vibroseis sources at 196 locations recorded by 238 three-com
 ponents receivers. We assess two prior velocity models, based on travel ti
 me inversion and on interferometry, for full waveform inversion to further
  refine the Earth model and identify shallow fluid circulation. We have al
 so developed a 3D seismic model of the Western US based on available publi
 c broadband waveforms from moderately large earthquakes (MW 5-6.5) and att
 empt to fit waveforms with periods down to 5-10 seconds. The goal is to sh
 ow how refined 3D Earth models can improve source characterization of even
 ts of smaller magnitude. For both these applications, we leverage the use 
 of Salvus, an end-to-end seismic imaging solution, reling on the spectral 
 element method to compute forward and adjoint simulations. It includes int
 egrated workflow management that handles waveform and metadata, launches s
 imulations, computes waveform misfits and adjoint sources, and iterates fo
 r model updates by nonlinear optimization. This work was performed under t
 he auspices of the U.S. Department of Energy by LawrenceLivermore National
  Laboratory under Contract DE-AC52-07NA27344.\n\nDomain: CS and Math, Phys
 ics, Solid Earth Dynamics
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