The research performed
by members of the GGL divides into two general categories, basic and applied
research. The applied research is performed under the Colorado
Center for Imaging, Tomography, and Analysis (CCITA).
The basic research itself
divides into two types. The first is seismic studies of the crust and mantle.
These studies are currently concentrating on the use of surface waves to
map the structure of the crust and upper mantle under Antarctica, the Arctic,
Eurasia, and South America and on normal modes to map the structure of
the lower mantle. Most of this work is done by Prof. Ritzwoller's
group. The second is geodetic and geodynamic studies of the earth's response
to time-varying mass distributions in the hydrosphere and solid earth.
Most of this work is performed by Prof. Wahr and collaborators.
(address questions to Mike
Funding Agencies: NATO, NSF - AST, NSF - EAR, NSF- OPP, DSWA
Test Ban Treaty ( CTBT) verification (Levshin, Ritzwoller)
wave tomography of Eurasia (Barmin, James, Levshin, Ritzwoller)
wave tomography of Antarctica (Barmin, Levshin, Ritzwoller, Vdovin,
wave tomography of South America (Levshin, Ritzwoller, Vdovin)
wave tomography of the Arctic (Barmin, Levshin, O'Sullivan, Ritzwoller)
mode seismology (Resovsky, Ritzwoller)
seismic wavefield simulation (Heo, Ritzwoller, Levshin)
questions to John Wahr)
Funding Agencies: NSF - EAR, NASA
post-glacial rebound and seismology (Tamisiea, Wahr)
gravity measurements. Applications in:
oceanography, glaciology, solid earth (Wahr)
tides, ocean tides, rotation of the Earth (Wahr, Robertson)
altimetry studies of steric and barotropic oceanic disturbances and (combined
with tidal gauge data) crustal deformation (Leuliette, Wahr, VanDam)
measurements of crustal deformation caused by present-day loading of the
Earth's surface (Larson, Wahr, VanDam)
and gravity measurements in Greenland (Larson, Wahr, VanDam, Robertson)