Data Services Products: EMC-CRUST2.0 A Global Crustal Model at 2x2 Degrees

Summary

CRUST2.0 (Bassin, Laske, & Masters, 2000) is a global crustal model specified on a 2°-by-2° grid and incorporates the global sediment thickness.
Note: This model is superseded by the higher-resolution crustal model CRUST1.0. Authors discourage the usage of this model.

Description

Name CRUST2.0
Title A 2-by-2 Degree Global Model of Earth’s Crust
Type Crustal Earth Model
Sub Type Crustal profile
Year 2000
Data Revision r0.0 (revision history)
   
Short
Description
   
The CRUST 2.0 is an updated version of CRUST 5.1 (Mooney, Laske and Masters, 1998). This model is specified on a 2×2 degree grid and takes advantage of a compilation of global sediment thickness which is defined on a 1×1 degree grid. Also, the ice thickness is compiled on the same scale. The compilation used for this model covers most of Eurasia, North America, Australia and some areas of Africa and South America and in the oceans.
 
The original global crustal models CRUST 5.1 and CRUST2.0 use type keys to assign various types of crustal structure (such as Archean, early Proterozoic, rifts etc.) in each cell. Starting with CRUST5.1, cells in CRUST2.0 were adjusted in type to better reflect the edges of shelves and the coastline. Adjustments have been made in some tectonic regions in the Americas and Eurasia (especially around the orogenic belts). Adjustments to the ice thickness were also made in each cell and is now within 250m of the true ice thickness. Sediment thicknesses in each cell are to within 1.0 km of the true sediment thickness and crustal thickness are within 5 km of the true crustal thickness. Bathymetry and topography is that of ETOPO5.
 
The 2×2 degree model is composed of 360 key 1d-profiles (compared to 139 of CRUST5.1) where one of these profiles is assigned to each 2 × 2 degree cell. Each individual profile is a 7 layer 1D-model with
 
1.  ice
2.  water
3.  soft sediments
4.  hard sediments
5.  upper crust
6.  middle crust
7.  lower crust
 
Parameters VP, VS and rho are given explicitly for these 7 layers as well as the mantle below the Moho.
The variable names in the netCDF version of the CRUSt2.0 model are based on the above seven layers (see the model metadata for a complete list of the variables).
 
Usage Notes   Authors discourage the usage of this model. Users are encouraged to use the CRUST1.0 model.
Each layer in this model is represented as a single 2D variable (for example, see the CRUST2.0.nc metadata). The values are cell-based and evaluated at the cell centers (model variables are defined tile by tile with the geographical coordinates referring to the center of tile).
   
Authors: Gabi Laske, IGPP, Scripps Institution of Oceanography, U.C. San Diego, La Jolla, CA, USA
Guy Masters, IGPP, Scripps Institution of Oceanography, U.C. San Diego, La Jolla, CA, USA
Christine Reif, Department of Earth Sciences, Institute of Geophysics and Planetary Physics, University of California, Santa Cruz, Santa Cruz, CA 95064
 
Base Model CRUST5.1
   
Referenced by SALSA3D, CRUST1.0
Model Download  
CRUST2.0.r0.0.nc is the netCDF file for the above model (see the model metadata for a complete list of the variables).
 
Model Homepage https://igppweb.ucsd.edu/~gabi/crust2.html
Depth Coverage 0 km to the Moho depth
Area Global
 

eastern hemisphere visualization of the crustal thicknessal_thickness
Figure 1. The eastern hemisphere visualization of the crustal_thickness (crustal thickness, km) from CRUST2.0-.r0.0.nc, using the emc-ParaView plugins.

western hemisphere visualization of the crustal thickness
Figure 2. The western hemisphere visualization of the crustal_thickness (crustal thickness, km) from CRUST2.0-.r0.0.nc, using the emc-ParaView plugins.

Citations and DOIs

To cite the original work behind this Earth model:

  • Bassin, C., Laske, G. and Masters, G., The Current Limits of Resolution for Surface Wave Tomography in North America, EOS Trans AGU, 81, F897, 2000.

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:

Reference

  • A description of CRUST 5.1 can be found in: Mooney, Laske and Masters, CRUST 5.1: a global crustal model at 5×5 degrees, JGR, 103, 727-747, 1998.

Credits

  • r0.0 Model provided by Gabi Laske.

Revision History

revision r0.0: uploaded December 13, 2021.

Categories

Page built 01:51:43 | v.b'108166