The research performed by members of the GGL divides
into two categories. The fiirst 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. Aspects of the surface wave research are relevant to
Comprehensive Test Ban Treaty verification, in particular in detecting
surface wave packets and in discriminating between earthquakes and nuclear
explosions. This is described further in `Seismology for Peace'. 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.
Seismology
(address questions to Mike
Ritzwoller)
-
Comprehensive
Test Ban Treaty ( CTBT) verification (Levshin, Ritzwoller)
-
Surface
wave tomography of Eurasia (Barmin, James, Levshin, Ritzwoller)
-
Surface
wave tomography of Antarctica (Barmin, Levshin, Ritzwoller, Vdovin,
Rial)
-
Surface
wave tomography of South America (Levshin, Ritzwoller, Vdovin)
-
Surface
wave tomography of the Arctic (Barmin, Levshin, O'Sullivan, Ritzwoller)
-
Normal
mode seismology (Resovsky, Ritzwoller)
-
Helioseismology
(Ritzwoller, Stebbins)
Funding Agencies: NATO, NSF - AST, NSF - EAR, NSF- OPP, DSWA
Seismology publications
Geodynamics/Geodesy
(address questions to John
Wahr)
-
Geodynamics,
post-glacial rebound and seismology (Tamisiea, Wahr)
-
Satellite
gravity measurements. Applications in:
-
hydrology,
oceanography, glaciology, solid earth (Wahr)
-
Earth
tides, ocean tides, rotation of the Earth (Wahr, Robertson)
-
Satellite
altimetry studies of steric and barotropic oceanic disturbances and (combined
with tidal gauge data) crustal deformation (Leuliette, Wahr, VanDam)
-
Geodetic
measurements of crustal deformation caused by present-day loading of the
Earth's surface (Larson, Wahr, VanDam)
-
GPS
and gravity measurements in Greenland (Larson, Wahr, VanDam, Robertson)
Funding Agencies: NSF - EAR, NASA
Geodynamics/Geodesy publications