Data Services Products: EMC-CUSRA2021 A radially anisotropic shear wave velocity model for the upper mantle of Contiguous US Type: 3-D Tomography Earth Model

Summary

CUSRA2021 is a radially anisotropic shear wave velocity model for the upper mantle structure of contiguous US, from adjoint full waveform inversion.

Description

Name CUSRA2021
Title A radially anisotropic shear wave velocity model for the upper mantle of Contiguous US
Type 3-D Tomography Earth Model
Sub Type Absolute Vsv and Vsh (km/s)
Year 2022
Data Revision r0.0 (revision history)
 
Short Description   CUSRA2021 model is developed by adjoint full waveform inversion using intermediate period body and surface waves. The inversion minimizes a geographically weighted frequency-dependent travel-time misfit function with a multiscale strategy. The waveform forward and adjoint modelling is performed by spectral element method using a software package SPECFEM3D_GLOBE (Komatitsch & Tromp, 2002a, b).
 
Authors: Tong Zhou, Michigan State University, now at Aramco Research Center – Beijing

Jiaqi Li, Michigan State University, now at University of California, Los Angeles

Ziyi Xi, Michigan State University

Guoliang Li, Michigan State University, now at University of Southern California

Min Chen, Michigan State University
 
Reference Model N/A
 
Previous Model N/A
 
Model Download CUSRA2021.r0.0.nc (see metadata) is the netCDF 3 Classic file for the model that contains Vsv, vertical polarized shear wave velocity (km/s), and Vsh, horizontal polarized shear wave velocity (km/s).
 
Depth Coverage 60 to 410 km
 
Area The contiguous US and surrounding regions (25 °/54.5 °, -125 °/-65.5 °)
 
Data Set Description 15-50 s body waves and 30-120 s surface waves are recorded by 5,280 broadband stations in the United States, Canada, and Mexico, from 160 earthquake events selected from the global centroid moment tensor catalog (Ekström et al., 2012) and the SLU regional moment tensor catalog (Herrmann et al., 2011).
 
 

CUSRA2021
CUSRA2021. (a) Study region (red box), computational domain (white box), events (beachballs), and stations (yellow triangles). (b) Vs (Voigt average, V_s=√(〖2V〗_SV^2/3+V_SH^2/3)) perturbation at 200 km. (c) Radial anisotropy (ξ=〖(V〗_SH-V_SV)/V_SV) at 200 km. Green lines show geological boundaries, and magenta lines show the boundaries of Wyoming Craton and Superior Craton (See Zhou et al., 2022 for details). (d) Cross-section of Vs perturbation and radial anisotropy along 40N. (e) Cross-section of Vs perturbation and radial anisotropy along 90W. Magenta dashed lines show LAB and “X” phase imaged by receiver functions in Kind et al., (2020). Geological unit marks in the figure: NBR, North Basin and Range; SRM, South Rocky Mountains; MCR, Mid Continental Rift; IL, Illinois microblock; APP, Appalachian Mountains; CP, Colorado Plateau; SPC, Superior Craton.

Citations and DOIs

To cite the original work behind this Earth model:

  • Zhou, T., Li, J., Xi, Z., Li, G., & Chen, M. (2022). CUSRA2021: A radially anisotropic model of the contiguous US and surrounding regions by full-waveform inversion. Journal of Geophysical Research: Solid Earth, 127, e2021JB023893. https://doi.org/10.1029/2021JB023893

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.2022.cusra2021.1

References

  • Ekström, G., Nettles, M., & Dziewoński, A. (2012). The global CMT project 2004–2010: Centroid-moment tensors for 13,017 earthquakes. Physics of the Earth and Planetary Interiors, 200–201, 1–9. https://doi.org/https://doi.org/10.1016/j.pepi.2012.04.002
  • Herrmann, R. B., Benz, H., & Ammon, C. J. (2011). Monitoring the earthquake source process in North America. Bulletin of the Seismological Society of America, 101(6), 2609–2625. https://doi.org/https://doi.org/10.1785/0120110095
  • Komatitsch, D., & Tromp, J. (2002b). Spectral-element simulations of global seismic wave propagation—II. Three-dimensional models, oceans, rotation and self-gravitation. Geophysical Journal International, 150(1), 303–318. https://doi.org/https://doi.org/10.1046/j.1365-246x.2002.01716.x

Credits

  • r0.0 model provided by Tong Zhou.

Revision History

revision r0.0: uploaded August 22, 2022.

Timeline

2022-08-31
online

Categories

18:29:56 v.d6084d45