The Collaborative Seismic Earth Model: Generation 2

Noe, Sebastian; van Herwaarden, Dirk‐Philip; Thrastarson, Solvi; Pienkowska, Marta; Masouminia, Neda; Ma, Jincheng; Bunge, Hans‐Peter; Wehner, Deborah; Rawlinson, Nicholas; Gao, Yajian; Tilmann, Frederik; Rodgers, Artie; Fichtner, Andreas

doi:10.1029/2024jb029656

Title: The Collaborative Seismic Earth Model: Generation 2

Journal Article · 08 December 2024 · Journal of Geophysical Research. Solid Earth

DOI: https://doi.org/10.1029/2024jb029656 · OSTI ID:2496853

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Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland); Ludwig Maximilian Univ. of Munich (Germany); University of Tehran (Iran)
Ludwig Maximilian Univ. of Munich (Germany); Peking Univ., Beijing (China)
Ludwig Maximilian Univ. of Munich (Germany)
Univ. of Cambridge (United Kingdom)
Helmholtz-Zentrum Potsdam (HZP), (Germany). German Research Centre for GeoSciences; Karlsruhe Inst. of Technology (KIT) (Germany)
Helmholtz-Zentrum Potsdam (HZP), (Germany). German Research Centre for GeoSciences
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: European Research Council (ERC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2496853

Report Number(s):: LLNL--JRNL-865309; 1099452

Journal Information:: Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 12 Vol. 129; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Dataset related to article 'The Collaborative Seismic Earth Model: Generation 2' Noe, Sebastian; van Herwaarden, Dirk Philip; Thrastarson, Solvi Zenodo https://doi.org/10.5281/ZENODO.11047927	dataset	January 2024
The Long-wavelength Earth model (LOWE) at 50 s Minimum Period Thrastarson, Solvi; van Herwaarden, Dirk-Philip; Noe, Sebastian Zenodo https://doi.org/10.5281/ZENODO.11279695	model	January 2024

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