HR: 17:45h
AN: T34B-08 INVITED [Abstracts]
TI: Scotia Arc Kinematics From GPS Geodesy
AU: * Smalley, R
EM: smalley@ceri.memphis.edu
AF: Center for Earthquake Research and Information
The University of Memphis, 3876 Central Ave, Suite 1, Memphis, TN 38138, United States
AU: Dalziel, I W
EM: ian@utig.ig.utexas.edu
AF: University of Texas Institute for Geophysics
Jackson School of Geosciences, J.J. Pickle Research Campus
Bldg. 196
10100 Burnet Road, Austin, TX 78758, United States
AU: Bevis, M G
EM: mbevis@osu.edu
AF: School of Earth Sciences
Ohio State University, 125 South Oval Mall, Columbus, OH 43210, United States
AU: Kendrick, E
EM: kendrick.42@osu.edu
AF: School of Earth Sciences
Ohio State University, 125 South Oval Mall, Columbus, OH 43210, United States
AU: Stamps, D S
EM: dsstamps@memphis.edu
AF: Center for Earthquake Research and Information
The University of Memphis, 3876 Central Ave, Suite 1, Memphis, TN 38138, United States
AU: Taylor, F W
EM: fred@utig.ig.utexas.edu
AF: School of Earth Sciences
Ohio State University, 125 South Oval Mall, Columbus, OH 43210, United States
AB:
We obtain the first Scotia and South Sandwich plate Euler vector estimates not dependent on closure using a
combination of GPS crustal velocity data from the Scotia and South Sandwich plates, transform azimuths,
spreading data, and an updated earthquake slip vector catalog. Neither the GPS data, which are tied to the global
plate reference frame but sample only limited portions of the two plates, nor the geologic data, which are not tied
to the global spreading circuit, are sufficient to individually define the Euler vectors. In addition, the Scotia plate
GPS measurements do not sample the stable plate interior and it is necessary to model the plate boundary
deformation field for the Euler vector estimation. Our GPS based South America-Antarctic and Scotia-South
Sandwich Euler pole estimates are in good agreement with previous estimates from either GPS or geologic data
alone. The new South America-Scotia Euler pole, however, is significantly different and is near the South America-
Antarctica Euler vector.
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1243 Space geodetic surveys
DE: 8158 Plate motions: present and recent (3040)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting