Data Services Products: EMC-Alaska.ANT+RF.Ward.2018 3D shear-wave velocity model of the Alaskan Cordillera from the joint inversion of ambient noise tomography and receiver functions.

Summary

3D shear-wave velocity model of the Alaskan Cordillera from the joint inversion of ambient noise tomography and receiver functions.

Description

Name Alaska.ANT+RF.Ward.2018
Title 3D shear-wave velocity model of the Alaskan Cordillera from the joint inversion of ambient noise tomography and receiver functions.
Type 3-D Tomography Earth Model
Sub Type Shear-wave velocity (km/s)
Year 2018
 
Short Description   The model incorporates seismic data from an earlier ambient noise tomography study (Ward, 2015) along with new Transportable Array data to image the shear wave velocity structure of the Alaskan Cordillera from the joint inversion of surface wave dispersion and receiver functions.
Authors:  
Kevin M. Ward
Department of Geology and Geological Engineering
South Dakota School of Mines & Technology
501 E. Saint Joseph St., Rapid City, SD 57701, USA
 
Fan-Chi Lin
Department of Geology and Geophysics
The University of Utah
115 South 1460 East, Salt Lake City, UT 84112, USA
 
Previous Model None
Reference Model None
Model Download Alaska.ANT+RF.Ward.2018_kmps.nc (see metadata ), is the netCDF file for the model as a function of depth
Model Homepage
Depth Coverage 0 to 70 km (bsl)
Areal Coverage The Alaskan Cordillera (latitude: 52°N/73°N, longitude: 113°W/173W°)
 
Data Set Description [Ward and Lin, (2018)] The dataset includes the absolute S-wave velocity structure across the Alaskan Cordillera from the joint inversion of ambient noise tomography and receiver functions.

hear-wave velocity results for 5, 20, 35, and 45 km depth
Figure 1. Shear-wave velocity results for 5, 20, 35, and 45 km depth (b.s.l.). Colored circles show the shear-wave velocity from the 1-D joint receiver function and surface wave inversions results whereas the maps show the final 3-D surface-wave only shear-wave inversion results. Black lines show major terrane boundaries [Colpron et al., 2007]. The 5 km depth map highlights basins across our study area (e.g. low shear-wave velocities) whereas the 35 km depth map highlights the large crustal thickness variations across our study area (e.g. sharp changes in shear-wave velocities across terrane boundaries. The white lines contour a 100 km radius from any station used in our receiver function analysis and provides a reference to highlight areas of our model that incorporate both surface-wave and receiver function constraints.

Shear-wave velocity results for 5 cross-sections though our model
Figure 2. Shear-wave velocity results for 5 cross-sections though our model (no vertical exaggeration). (a-e) Long wavelength (>75 km) Bouguer gravity anomalies [Bonvalot et al., 2012] are also included and projected onto each cross-section behind the vertically exaggerated topography. Major faults acting as terrane boundaries are shown as dashed vertical black lines with major geologic features identified at the top of each cross-section. The continental Moho picks from 4 studies are projected onto our cross-section results and shown as orange squares [IRIS DMC, 2010] green diamonds [Allam et al., 2017] gray triangles [Tarayoun et al., 2017] and red circles [Miller et al., 2018]. The continental Moho model generated from a nonperturbational linear surface-wave only inversion [Haney et al., 2016] is shown as reds lines in the cross-sections. White lines contour the Slab 1.0 slab model [Hayes et al., 2012] and an alternate top of slab model that extends further to the east is also projected onto our cross-sections and shown as yellow lines [Pavlis et al., 2018]. A slab Moho model corresponding to the top of slab model is also included as purple lines [Pavlis et al., 2018]. (f) Map showing the locations of each cross-section. PWS, Prince William Sound; CF, Contact Fault; CT, Chugach Terrane; BRF, Border Ranges Fault; CIB, Cook Inlet Basin; WCT, Wrangellia Composite Terrane; FF, Farewell Fault; SB, Susitna Basin; MB, Minchumina Basin; YCT, Yukon Composite Terrane; DF, Denali Fault; NB, Nenana Basin; BR, Brooks Range; NS, North Slope; CRB, Copper River Basin; TF, Tintina Fault; and YFB, Yukon Flats Basin.

Citations and DOIs

To cite the original work behind this Earth model:

  • Ward, K. M., and Lin, F., (2018), Lithospheric Structure Across the Alaskan Cordillera from the Joint Inversion of Surface Waves and Receiver Functions, Journal of Geophysical Research: Solid Earth, v. XXX, no. XX, p. XXXX- XXXX. https://doi.org/10.1002/2018JB015967.

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:

References

  • Allam, A.A., Schulte-Pelkum, V., Ben-Zion, Y., Tape, C., Ruppert, N., & Ross, Z. (2017), Ten kilometer vertical Moho offset and shallow velocity contrast along the Denali fault from double-difference tomography, receiver functions, and fault zone head waves, Tectonophysics, 721, 56-69. https://doi.org/10.1016/j.tecto.2017.09.003
  • Bonvalot, S., Balmino, S., Briais, A., Kuhn, M., Peyrefitte, A., & Vales, N. (2012), World gravity map, Bureau Gravimetrique International (BGI) (CGMW-BGI-CNES-IRD, Paris).
  • Colpron, M., Nelson, J. L., & Murphy, D. C. (2007), Northern cordilleran terranes and their interactions through time, GSA Today, 17(4-5), 4-10.
  • Haney, M. M., Tsai, V. C., & Ward, K. M. (2016), Widespread imaging of the lower crust, Moho, and upper mantle from Rayleigh waves: A comparison of the Cascadia and Aleutian-Alaska subduction zones, Abstract T11D-2645, presented at 2016 Fall Meeting, AGU, San Francisco, Calif., 12-16 Dec.
  • Miller, M. S., O’Driscoll, L. J., Porritt, R. W., & Roeske, S. M. (2018), Multiscale crustal architecture of Alaska inferred from P receiver functions, Lithosphere. https://doi.org/10.1130/L701.1
  • Pavlis, G. L., Bauer, M. A., Elliott, J. L., Koons, P., Pavlis, T. L., Ruppert, N., Ward, K. M., and Worthington, L. L., (2018), A unified three-dimensional model of the lithospheric structure at the subduction corner in southeast Alaska: Summary results from STEEP, Geosphere. https://doi.org/10.1130/GES01488.1
  • Tarayoun, A., Audet, P., Mazzotti, S., & Ashoori, A. (2017), Architecture of the crust and uppermost mantle in the northern Canadian Cordillera from receiver functions, J. Geophys. Res., 122, 5268-5287. https://doi.org/10.1002/2017JB014284

Credits

Model provided by Kevin M. Ward

Timeline

2018-09-28
Added

Categories

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