Geophysical Research Letters
Supporting Information for
Lithospheric Records of Orogeny within the Continental US
Ryan Porter1*, Yuanyuan Liu2, William E. Holt2
1School of
Earth Sciences and Environmental Sustainability
Northern Arizona University
Geology Building – Box 4099
Flagstaff, AZ 86011
2Department
of Geosciences, Stony Brook University
*Corresponding
Author
Contents of this file
Figures S1 to S8
Introduction
The following supplemental information contains eight figures showing the phase velocity
results from the ambient noise and gradiometry analysis, the absolute value of the differences
between the two, the constraints used in the starting model, map views of results from varying
starting models, and a comparison of shear inversion results.
1
Figure S1. Maps showing the phase velocity variations calculated using ambient
noise tomography.
2
Figure S2. Maps showing the phase velocity variations calculated using
gradiometry.
3
Figure S3. Maps showing the absolute value of the difference between phase
velocities calculated using ambient noise tomography and gradiometry at 20, 30 and 40
second periods.
4
Figure S4. Map view of the EARS-derived crustal thickness model used in the
inversions.
5
Figure S5. Map view of the sediment thickness model used in the inversions.
6
Figure S6. Shear velocity model calculated using a constant velocity starting model with
a shear velocity of 4 km/s. Moho depths are determined from the same model as other
models. Because the Moho is not constrained, the Moho transition is much broader in this
model resulting in significant variations at lower crustal and upper mantle depths from
the other models.
7
Figure S7. Panel A: Shear velocity model where sediment thickness is constrained.
Panels B-F: Shear velocity model calculated using a constant crustal velocity model of
3.65 km/s and mantle velocity of 4.5 km/s.
8
Figure S8. Panel A: Starting shear model and inversion results for gridpoint 102º W 40 º
N. Panel B: Measured phase velocities and inversion results for gridpoint 102º W 40º N.
9