Data Services Products: EMC-Alaska-LFeng-2019_vsv_gamma A 3‐D Shear Velocity Model of the Crust and Uppermost Mantle Beneath Alaska Including Apparent Radial Anisotropy.

Summary

A 3‐D Shear Velocity Model of the Crust and Uppermost Mantle Beneath Alaska Including Apparent Radial Anisotropy.

Description

Name Alaska-LFeng-2019_vsv_gamma
Title A 3‐D Shear Velocity Model of the Crust and Uppermost Mantle Beneath Alaska Including Apparent Radial Anisotropy.
Type 3-D Tomography Earth Model
Sub Type Shear-wave velocity in km/s. Strength of radial anisotropy in %.
Year 2019
 
Short Description   A model of the 3‐D shear velocity structure of the crust and uppermost mantle beneath Alaska and its surroundings on a ~50‐km grid, including crustal and mantle radial anisotropy, based on seismic data recorded at more than 500 broadband stations. The model derives from a Bayesian Monte Carlo inversion of Rayleigh wave group and phase speeds and Love wave phase speeds determined from ambient noise and earthquake data.
Authors:  
Lili Feng
USI Imaging
Compagnie Générale de Géophysique (CGG)
 
Michael Ritzwoller
Department of Physics
University of Colorado Boulder
Boulder, CO, USA
 
Previous Model None
Reference Model ak135
Model Download Alaska-LFeng-2019-vsv-gamma.nc (see metadata ), is the netCDF file for the model as a function of depth
Model Homepage
Depth Coverage 0 to 200 km
Area Alaska and northwestern Canada (approx. 52°/72° latitude and -172°/-122° longitude)
 
Data Set Description This dataset includes the absolute shear wave velocity structure with radial anisotropy of the crust and uppermost mantle beneath Alaska, derived from a joint inversion of the Rayleigh and Love wave data extracted from both ambient noise and earthquakes. The model is constructed with a Bayesian Monte Carlo inversion algorithm, providing reliable information about model uncertainties.

The mean of the posterior distribution of Vsv models at two depth
Figure 1. The mean of the posterior distribution of Vsv models at two depth
ranges in the mantle (central‐depth ± 3 km) with central‐depths of (a) 60 km
and (b) 100 km. Symbols are similar to Figure 11 in Feng & Ritzwoller (2019),
but additionally the cyan curve is the top edge of the subducting slab at each
map depth from the slab model of Jadamec and Billen (2010) and the lines E‐E′
identifies the vertical profile shown in Figure 21 in Feng & Ritzwoller (2019).

Figure 2
Figure 2. Apparent (a) crustal (γc) and (b) mantle (γm) radial anisotropy
determined from the mean of the posterior distribution using both Rayleigh
and Love wave data. We consider estimates of γc to be indeterminate if the
standard deviation of the posterior distribution for γc is greater than 1.0% or
in the Colville Basin where we estimate γs rather than γc. Estimates of γm are
considered indeterminate if the standard deviation of the posterior distribution
is greater than 1.5%. The gray squares identify the indeterminate grid nodes.
This includes the whole of the Colville Basin for crustal anisotropy.

Citations and DOIs

To cite the original work behind this Earth model:

  • Feng, L., and M.H.Ritzwoller, A 3-D shear velocity model of the crust and uppermost mantle beneath Alaska including apparent radial anisotropy, J. Geophys. Res. Solid Earth, 124, 19,468-10,497, https://doi.org/10.1029/2019JB018122, 2019.

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/emcalaskalfeng2019

References

  • Jadamec, M. A., & Billen, M. I. (2010). Reconciling surface plate motions with rapid three‐dimensional mantle flow around a slab edge. Nature, 465(7296), 338–341. https://doi.org/10.1038/nature09053

Credits

Model provided by Lili Feng

Timeline

2020-01-06
online

Categories

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