Data Services Products: EMC-GLAD-M35 A joint P and S global tomographic model with uncertainty quantification

Summary

An elastic model with radial anisotropy confined to the upper mantle. The model is the successor of GLAD-M25 with a 50% increase in event number and more than double the number of windows.

Description

Name GLAD-M35
Title A joint P and S global tomographic model with uncertainty quantification
Type 3-D Tomography Earth Model
Sub Type Joint P and S velocity, Uncertainty, Anisotropic (in the uppermost mantle)
Year 2024
Data Revision r.0.1 (revision history)
Notes r.0.1: Flattened the topography of 410km and 660km boundaries, which removes the wave speed discontinuities in the layers around them.
 
Short Description   An elastic model with radial anisotropy confined to the upper mantle. The model is the successor of GLAD-M25 with a 50% increase in event number and more than double the number of windows. GLAD-M35 features improved constraints on the deep mantle, especially compressional wave speed which is typically harder to constrain than shear wave speed. An estimation of the standard deviation of the model parameters based on the BFGS update history is provided.
 
Authors: Congyue Cui, Department of Geosciences, Princeton University, Princeton, NJ, USA

Wenjie Lei, Google, Mountain View, NJ, USA

Qiancheng Liu, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

Daniel Peter, St. Gallen, Switzerland

Ebru Bozdağ, Departments of Applied Mathematics & Statistics and
Geophysics, Colorado School of Mines, Golden, CO, USA

Jeroen Tromp, Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ, USA

Norbert Podhorszki, Lawrence Livermore National Laboratory, Livermore, CA, USA

David Pugmire, Oak Ridge National Laboratory, Oak Ridge, TN, USA
 
Previous Model GLAD-M25
Reference Model STW105
Model Homepage https://github.com/icui/glad-m35
Model Download
  • GLAD-M35.r0.1-n4.nc (see metadata), is the netCDF 4 Classic file for vertical shear wave speed (Vsv), horizontal shear wave speed (Vsh), vertical compressional wave speed (Vpv), horizontal compressional wave speed (Vph), dimensionless parameter eta, and standard deviations of shear and compressional wave speed (std_vs and std_vp).
 
Depth Coverage Whole Mantle (10 to 2890 km)
Area Global (-90°/90°, longitudes: -180°/180°)
 
Data Set Description 2,160 earthquakes selected from the Global CMT Catalog, and whose waveforms we downloaded from many data centers, including IRIS, ORFEUS, INGV, IPGP, ETH, and GEONET. Global Seismic Network (II, IU, IC, US, CU, and GT), GEOFON (GE), GEOSCOPE (G), regional and temporary networks, such as US Array (TA), Africa Array (AF), the Canadian National Seismograph Network (CN), Geoscience Australia (AU), the Antarctic Seismographic Argentinean Italian Network (AI), the New Zealand National Seismograph Network (NZ), and the F-net broadband seismograph network by NIED, MedNet (MN), the Brazilian Lithospheric Seismic Project (BL), the Chilean National Seismic Network©, and the Japan Meteorological Agency Seismic Network (JP).

Map
Map views of model GLAD-M35 at depths of 140 km, 600 km, 1,300 km, 1,700 km, 2,100 km, 2,500 km, and 2,800 km, showing shear wavespeed perturbations (Left column), bulk sound speed perturbations (Middle column), and compressional wavespeed perturbations (Right column).

Citations and DOIs

To cite the original work behind this Earth model:

  • Congyue Cui, Wenjie Lei, Qiancheng Liu, Daniel Peter, Ebru Bozd ̆ ag, Jeroen Tromp, Judith Hill, Norbert Podhorszki, and David Pugmire, GLAD-M35: A joint P and S global tomographic model with uncertainty quantification, Geophys. J. Int, 2024, Accepted, https://doi.org/10.1093/gji/ggae270.

To cite IRIS DMC Data Products effort:

  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.

DOI for this EMC webpage: https://doi.org/10.17611/dp/emc.2024.gladm35.1

Credits

  • r.0.0 model provided by Congyue Cui.
  • r.0.1 model provided by Congyue Cui.

Revision History

revision r.0.0: uploaded August 5, 2024.
revision r.0.1: uploaded August 12, 2024.

Timeline

2024-08-09
r0.0 online
2024-08-12
r0.1 online

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