Data Services Products: EMC-FWT_MiddleAmerica_2023 3-D shear-wave velocity model of the Middle American subduction margin

Summary

A new three-dimensional shear-wave velocity model of the entire Middle American subduction system, using full-wave ambient noise tomography.

Description

Name FWT_MiddleAmerica_2023
Title 3-D shear-wave velocity model of the Middle American subduction margin
Type 3-D Tomography Earth Model
Sub Type Shear-wave velocity (km/s)
Year 2023
Data Revision r0.0 (revision history)
 
Short Description   A new three-dimensional shear-wave velocity model of the entire Middle American subduction system, using full-wave ambient noise tomography.
 
Authors: Meng Liu, Department of Geosciences, University of Massachusetts Amherst, 627 North Pleasant Street. Amherst, MA 01003, E-mail: mengliu@umass.edu

Haiying Gao, Department of Geosciences, University of Massachusetts Amherst, 627 North Pleasant Street. Amherst, MA 01003, E-mail: haiyinggao@umass.edu
 
Reference Model The initial reference model is composed of the 2°×2° global shear-wave velocity model (Shapiro & Ritzwoller, 2002) for the top 396 km and the 1-D AK135 velocity model (Kennett et al., 1995) at greater depths.
 
Prior Model None
 
Model Download FWT-MiddleAmerica-2023-vs.r0.0.nc (see metadata) is the model in netCDF 3 Classic format.
 
Model Home Page None
 
Depth Coverage 0-200 km
 
Area Middle American subduction system (latitude: 7.0°/23.0°; longitude: -107°/-81°)
 
Data Set Description Our model extends from longitude 107°W to 81°W, latitude 7°N to 56°N, and depths from the surface down to 200 km. We parametrize the model domain into 0.04° × 0.04° in the longitudinal and latitudinal directions. The vertical grid spacing is depth dependent, which increases from ~1.5 km near the surface to ~5.4 km at 200 km depth.
 
 

Figure 1
Figure 1. (a-d) Shear-wave velocities at the depths of 49 km, 76 km, 105 km, and 120 km. The gray shaded areas mask the regions with low resolutions (i.e. less than 70% recovery of the input velocity perturbation) based on the checkerboard resolution test in Fig. S12. The distinct velocity reductions are labeled as VR1, VR2, VR3, and VR4. The red lines in (d) mark the profile locations in Figs. 2.

Figure 2
Figure 2. (a-f) Vertical cross-sections of the tomographic model at the depths of 5–200 km. The thick black lines represent the plate interface of Slab2.011. The gray lines represent the Moho depth extracted from CRUST 1.061. The white lines represent the Vs = 4.5 km/s contours. The gray lines represent the Vs = 4.3 km/s contours. The gray dots are the earthquakes, and the magenta triangles are the surface volcanoes. The gray shaded areas mask regions with low model resolutions (i.e. less than 70% recovery of the input velocity perturbation) based on the model recovery test for the geometry of the subducting slabs in Fig. S18.

Citations and DOIs

To cite the original work behind this Earth model:

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.2023.fwtmidamerica.1

Credits

  • r0.0 model provided by Meng Liu.

Revision History

revision r0.0: uploaded October 25, 2023.

Timeline

2023-11-01
r0.0 online

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