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    Global adjoint tomography - Model GLAD-M25

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    Type
    Article
    Authors
    Lei, Wenjie
    Ruan, Youyi cc
    Bozdaǧ, Ebru cc
    Peter, Daniel cc
    Lefebvre, Matthieu
    Komatitsch, Dimitri cc
    Tromp, Jeroen cc
    Hill, Judith
    Podhorszki, Norbert
    Pugmire, David
    KAUST Department
    Earth Science and Engineering Program
    Extreme Computing Research Center
    Physical Science and Engineering (PSE) Division
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Date
    2020-05-21
    Online Publication Date
    2020-05-21
    Print Publication Date
    2020-10-01
    Submitted Date
    2020-05-18
    Permanent link to this record
    http://hdl.handle.net/10754/665846
    
    Metadata
    Show full item record
    Abstract
    Building on global adjoint tomography model GLAD-M15, we present transversely isotropic global model GLAD-M25, which is the result of 10 quasi-Newton tomographic iterations with an earthquake database consisting of 1480 events in the magnitude range 5.5 ≤ Mw ≤ 7.2, an almost sixfold increase over the first-generation model. We calculated fully 3-D synthetic seismograms with a shortest period of 17 s based on a GPU-accelerated spectral-element wave propagation solver which accommodates effects due to 3-D anelastic crust and mantle structure, topography and bathymetry, the ocean load, ellipticity, rotation and self-gravitation. We used an adjoint-state method to calculate Fréchet derivatives in 3-D anelastic Earth models facilitated by a parsimonious storage algorithm. The simulations were performed on the Cray XK7 'Titan' and the IBM Power 9 'Summit' at the Oak Ridge Leadership Computing Facility. We quantitatively evaluated GLAD-M25 by assessing misfit reductions and traveltime anomaly histograms in 12 measurement categories. We performed similar assessments for a held-out data set consisting of 360 earthquakes, with results comparable to the actual inversion. We highlight the new model for a variety of plumes and subduction zones.
    Citation
    Lei, W., Ruan, Y., Bozdağ, E., Peter, D., Lefebvre, M., Komatitsch, D., … Pugmire, D. (2020). Global adjoint tomography—model GLAD-M25. Geophysical Journal International, 223(1), 1–21. doi:10.1093/gji/ggaa253
    Sponsors
    We thank Jeroen Ritsema, Steve Grand and two anonymous reviewers for detailed comments and suggestions which helped to improve an earlier version of the manuscript. This research used resources of the Oak Ridge Leadership Computing Facility, which is a DOE Office of Science User Facility supported under contract DE-AC05-00OR22725. Additional computational resources were provided by the Princeton Institute for Computational Science & Engineering (PICSciE). We acknowledge IRIS (iris.edu) and ORFEUS (orfeus-eu.org) for providing the data used in this study. We thank Ryan Modrak, Ridvan Örsvuran, Frederik J. Simons and James Smith for fruitful discussions, and Caio Ciardelli for implementing the spherical harmonic model expansion. The open source spectral-element software package SPECFEM3D GLOBE and the seismicmeasurement software package FLEXWIN used for this article are freely available via the Computational Infrastructure for Geodynamics (CIG; geodynamics.org). This research was supported by NSF grant 1644826.
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1093/gji/ggaa253
    Additional Links
    https://academic.oup.com/gji/article/223/1/1/5841525
    ae974a485f413a2113503eed53cd6c53
    10.1093/gji/ggaa253
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Extreme Computing Research Center; Earth Science and Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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