Data Services Products: EMC-OIINK_VS_model Shear velocity structure beneath the central United States

Summary

The Shear wave velocities are derived from Rayleigh wave phase velocities recorded by the OIINK Flex Array and Transportable Array stations in the central United States

Description

Name OIINK_VS_model
Title Shear velocity structure beneath the central United States
Type shear wave velocities
Sub Type
Year 2016
Short Description   Shear wave velocities derived from Rayleigh wave phase velocities recorded by the OIINK Flex Array and Transportable Array stations in the central United States.
Authors:  
Chen Chen
Department of Earth, Atmospheric, and Planetary Sciences
Purdue University
West Lafayette, Indiana, 47907, USA
Previous Model NA
Reference Model NA
Model Download oiink-VSVPRHO-model.nc (see metadata ), is the netCDF file for the model

OIINK_VS_model.txt
is the text file of the Vs model. This file has a header line with the following values:
min lat, max lat, dlat, min long, max long, dlong

then each data point after that line has these values:
grid point longitude, latitude
number of depth layers for model at grid point (# of layers)
thickness of layer #1, Vs, Vp, and density
thickness of layer #2, Vs, Vp, and density



Depth Coverage 0 – 410 km
Areal Coverage central United States (latitude: 30.0/46.0; longitude: -103/-75)
 
Data Set Description (see Chen et al., 2016)
Shear wave velocities determined by inverting phase velocities of fundamental model Rayleigh waves. Absolute shear wave velocities are included in km/s for the crust and upper mantle of the region. Relatively high crustal shear velocities characterize the southern Illinois Basin and may correspond to high-density mafic intrusions that were emplaced during the development of the Reelfoot Rift. This model also exhibits low upper mantle velocities beneath the New Madrid seismic zone compared to those outside of the rift. The extent of reduced upper mantle velocities also extends beneath the Wabash Valley and Ste. Genevieve seismic zones.
 
Supplemental Information
 

Shear velocity maps
[Chen et al., 2016] Shear velocity maps at depths of (a) 25 km, (b) 35 km, (c) 80 km, and (d) 100 km. Crustal velocity structure is presented for 25 km and 35 km depths and the depth slices of 80 km and 100 km show mantle velocities. Major fault and fold systems within the Illinois Basin are plotted on the crustal maps as green and gray lines respectively. The red oval and lines on the maps of 80 km and 100 km highlight the locations of the New Madrid, Wabash Valley, and Ste. Genevieve seismic zones.

Citations and DOIs

To cite the original work behind this Earth model:

  • Chen, C., H. Gilbert, C. Andronicos, M. W. Hamburger, T. Larson, S. Marshak, G. L. Pavlis, and X. Yan (2016), Shear velocity structure beneath the central United States: implications for the origin of the Illinois Basin and intraplate seismicity, Geochem. Geophys. Geosyst., 17, https://doi.org/10.1002/2015GC006206.

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

  • Chen, C., H. Gilbert, C. Andronicos, M. W. Hamburger, T. Larson, S. Marshak, G. L. Pavlis, and X. Yan (2016), Shear velocity structure beneath the central United States: implications for the origin of the Illinois Basin and intraplate seismicity, Geochem. Geophys. Geosyst., 17, https://doi.org/10.1002/2015GC006206.

Credits

Model provided by Hersh J. Gilbert

Timeline

2016-07-11
online

Categories

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