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GLAD-M25

Welcome to the GLAD-M25 wiki!

We used this page to host the information regarding to the GLAD-M25 for now. The offical website for GLAD-M25 is under construction and will be released when it is ready.

1. Introduction

This wiki is used to host GLobal ADjoint tomography model, GLAD-M25.

It contains several sub-pages:

1. SphTool: for visualization purpose only.
2. SPECFEM Mesh file: for high-precision model file and earthquake simulation in SPECFEM3D_GLOBE

2. Citation

If you plan to use it in your research, please considering citing this paper:

Wenjie Lei, Youyi Ruan, Ebru Bozdağ, Daniel Peter, Matthieu Lefebvre, Dimitri Komatitsch, Jeroen Tromp, Judith Hill, Norbert Podhorszki, David Pugmire, Global adjoint tomography—model GLAD-M25, Geophysical Journal International, Volume 223, Issue 1, October 2020, Pages 1–21, https://doi.org/10.1093/gji/ggaa253

or Bibtex format:

@article{10.1093/gji/ggaa253,
    author = {Lei, Wenjie and Ruan, Youyi and Bozdağ, Ebru and Peter, Daniel and Lefebvre, Matthieu and Komatitsch, Dimitri and Tromp, Jeroen and Hill, Judith and Podhorszki, Norbert and Pugmire, David},
    title = "{Global adjoint tomography—model GLAD-M25}",
    journal = {Geophysical Journal International},
    volume = {223},
    number = {1},
    pages = {1-21},
    year = {2020},
    month = {05},
    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.}",
    issn = {0956-540X},
    doi = {10.1093/gji/ggaa253},
    url = {https://doi.org/10.1093/gji/ggaa253},
    eprint = {https://academic.oup.com/gji/article-pdf/223/1/1/33476599/ggaa253.pdf},
}