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DTSTAMP:20190719T085743Z
LOCATION:HG E 1.2
DTSTART;TZID=Europe/Stockholm:20190612T160000
DTEND;TZID=Europe/Stockholm:20190612T163000
UID:submissions.pasc-conference.org_PASC19_sess133_msa156@linklings.com
SUMMARY:Evolutionary Multiscale Imaging of the Earth's Interior
DESCRIPTION:Minisymposium\nSolid Earth Dynamics\n\nEvolutionary Multiscale
  Imaging of the Earth's Interior\n\nFichtner, Afanasiev, Boehm, Hapla, Kri
 scher...\n\nThe Earth is heterogeneous at all scales, reflecting a wide sp
 ectrum of physical and chemical processes. Imaging the Earth's interior wi
 th maximum resolution requires the inversion of broadband seismic datasets
 , which are too large and too heterogeneous to be handled by one research 
 group, and which evolve over time. Here we present a framework for th
 e construction of a multiscale model of the Earth's interior that evolves 
 as new seismic data become available, and that can be constructed through 
 a community effort. Its most fundamental ingredient is <em>Salvus</em>, a 
 spectral-element solver of the seismic wave equation, which allows us to m
 odel wave propagation through the Earth at any scale without any significa
 nt approximations. <em>Salvus </em>is highly optimised in many respects, i
 ncluding massively parallel I/O, and numerical meshes adapted to the geome
 try of seismic waves. A newly developed stochastic gradient descent scheme
  enables the incorporation of new seismic data without the need to re-assi
 milate the complete dataset. This scheme forms the basis of both Earth mod
 el evolution and community interaction. The latest version of this <em>Col
 laborative Earth Model </em>will be presented.
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