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The Collaborative Seismic Earth Model: Generation 2

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1029/2024jb029656· OSTI ID:2496853
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [1]
  1. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
  2. Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Ludwig Maximilian Univ. of Munich (Germany); University of Tehran (Iran)
  3. Ludwig Maximilian Univ. of Munich (Germany); Peking Univ., Beijing (China)
  4. Ludwig Maximilian Univ. of Munich (Germany)
  5. Univ. of Cambridge (United Kingdom)
  6. Helmholtz-Zentrum Potsdam (HZP), (Germany). German Research Centre for GeoSciences; Karlsruhe Inst. of Technology (KIT) (Germany)
  7. Helmholtz-Zentrum Potsdam (HZP), (Germany). German Research Centre for GeoSciences
  8. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
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Geological interpretations, earthquake source inversions and ground motion modeling, among other applications, require models that jointly resolve crustal and mantle structure. With the second generation of the Collaborative Seismic Earth Model (CSEM2), we present a global multi-resolution tomographic Earth model that serves this purpose. The model evolves through successive regional- and global-scale refinements. While the first generation aggregated regional models, with this study, we ensure consistency between all individual submodels, resulting in a model that accurately explains wave propagation across scales. Recent regional tomographic models were incorporated, comprising continental-scale inversions for Asia and Africa, as well as regional inversions for the Western US, Central Andes, Iran, and Southeast Asia. Across all regional refinements, over 793,000 source-receiver pairs contributed. Moreover, the long-wavelength Earth model (LOWE) introduces large-scale structures outside of pre-existing local refinements. A full-waveform inversion for global anisotropic P-and S-wave speed structure over a total of 194 iterations with a minimum period of 50 s on a large data set of 1 hr of waveform data from 2,423 earthquakes and over 6 million source-receiver pairs ensures that regional updates in the crust and uppermost mantle translate into updates of deeper, global-scale structure. To test the performance of CSEM2, we evaluate waveform fits between observed and synthetic seismograms at 50 s for an independent data set on the global scale, and on the regional scale for lower periods. We accurately simulate waveforms within and across regional refinements, maintaining the original resolution of the submodels embedded in the global framework.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); European Research Council (ERC)
Grant/Contract Number:
AC52-07NA27344; 714069; 101058129
OSTI ID:
2496853
Report Number(s):
LLNL-JRNL-865309; 1099452
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 129, Issue 12; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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