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DTSTAMP:20190719T085744Z
LOCATION:HG E 1.2
DTSTART;TZID=Europe/Stockholm:20190612T163000
DTEND;TZID=Europe/Stockholm:20190612T170000
UID:submissions.pasc-conference.org_PASC19_sess133_msa237@linklings.com
SUMMARY:A New Generation of Earth Mantle Model Based on Adjoint Tomography
DESCRIPTION:Minisymposium\nSolid Earth Dynamics\n\nA New Generation of Ear
 th Mantle Model Based on Adjoint Tomography\n\nRuan, Lei, Lefebvre, Smith,
  Modrak...\n\nHigh-resolution images of the rising mantle plumes and subdu
 cting slabs are key to understand the dynamics of earth interior. To overc
 ome resolvability limits of the traditional ray-theoretical body- and surf
 ace-wave tomography, we use a spectral-element method (GPU-accelerated SPE
 CFEM3D_GLOBE) to accurately simulate seismograms in complex 3-D earth mode
 ls and adjoint-state method to iteratively minimize the difference between
  simulated waveforms and observations to constrain the model. The challeng
 e of this computationally intensive method lies that a tremendous amount o
 f data I/O and a well-organized workflow are required to simulate and proc
 ess the large seismic dataset iteration after iteration. We have dealt wit
 h the I/O bottleneck by developing the Adaptable Seismic Data Format (ASDF
 ) and parsimonious storage algorithm and introduced workflow management to
 ols. Harnessing the power of the Cray XK7 supercomputer “Titan&rdquo
 ; at the Oak Ridge Leadership Computing Facility, we have assimilated &sim
 ;17 million waveform data from 1,480 carefully selected earthquakes. We co
 nstructed a new generation of transversely isotropic earth mantle model wi
 th fine-scale features of mantle plumes and slabs, even in areas with rela
 tively sparse data coverage. We will present a summary of the technical im
 provements we made and the latest inversion results based on our current m
 odel, GLAD_M25.
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