Data Services Products: EMC-Alaska_NWCanada_Moho_2023 Depth of Moho beneath Alaska and Northwestern Canada

Summary

An up-to-date map of the crustal thickness in Alaska and northwestern Canada were extracted from P wave receiver functions using the common conversion point (CCP) stacking method.

Description

Name Alaska_NWCanada_Moho_2023
Title Depth of Moho beneath Alaska and Northwestern Canada
Type Crustal thicknesses
Sub Type Depth (km)
Year 2023
Data Revision r0.0 (revision history)
 
Short Description   An up-to-date map of the crustal thickness in Alaska and northwestern Canada were extracted from P wave receiver functions using the common conversion point (CCP) stacking method.
 
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 None
 
Prior Model None
 
Model Download Alaska-NWCanada-Moho-2023-0.5.r0.0.nc (see metadata) is the model in netCDF 3 Classic format.
 
Model Home Page None
 
Depth Coverage N/A
 
Area Alaska and northwestern Canada (latitude: 52.0°/72.0°; longitude: -170°/-120°)
 
Data Set Description This study calculates the P-wave receiver functions (RF) for 674 seismic stations in Alaska and northwestern Canada from 1999 to 2022 in order to provide an up-to-date map of the Moho depth distribution in this region. Our model extends from longitude 170°W to 120°W and latitude 52°N to 72°N. The Moho depth map is extracted from the common conversion point (CCP) stacking results by applying a 0.5° × 0.5° interpolation without any further lateral smoothing.
 
 

Figure 1
Figure 1. (a) Piercing point density of the radial-component RFs from all the backazimuthal directions at the depth of 40 km. (b) Moho depth map in Alaska and northwestern Canada. The gray lines mark the locations of the CCP stacking profiles in Figure 2. Both the piercing point density and the Moho depth map are generated by applying a 0.5° × 0.5° interpolation without any further lateral smoothing.

Figure 2
Figure 2. Representative CCP stacking profiles. The colorbar represents the normalized amplitudes of the radial-component RFs relative to the direct P arrivals. The positive phase indicates a slow-to-fast velocity transition with depth. The negative phase indicates a fast-to-slow velocity transition with depth. The colored patches mark the major tectonic units, and the white patch in© and (d) represents the minor terranes. The black squares mark the seismic stations and the magenta squares denote the stations closest to the Moho depth offsets. The red triangles are the Quaternary volcanoes. The thin vertical gray lines are the averaged RFs within each bin. The blue dots denote the preferred Moho depth in this study, and the gray dots mark the possible oceanic Moho. KoF, the Kobuk Fault; KaF, the Kaltag Fault; TF, the Tintina Fault; HCF, the Hines Creek Fault; DF, the Denali Fault; BDF, the Broder Range Fault. The profiles are plotted with a vertical exaggeration of 2.

Citations and DOIs

To cite the original work behind this Earth model:

  • Liu, M., & Gao, H. (2023). Variations of crustal thickness in Alaska and northwestern Canada: Implications for crustal modification and accretion of tectonic units. Journal of Geophysical Research: Solid Earth, 128, e2023JB027428. https://doi.org/10.1029/2023JB027428

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.alaska.nwcan.moho.1

Credits

  • r0.0 model provided by Meng Liu.

Revision History

revision r0.0: uploaded October 25, 2023.

Timeline

2023-10-25
r0.0 Online

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