HR: 0800h
AN: G21B-1280    [Abstracts]
TI: Plate Coupling in the Northeastern Caribbean
AU: * Przybylski, P A
EM: paprzyby@purdue.edu
AF: Geodesy, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: * Przybylski, P A
EM: paprzyby@purdue.edu
AF: Tectonophysics, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Calais, E
EM: ecalais@purdue.edu
AF: Geodesy, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Calais, E
EM: ecalais@purdue.edu
AF: Tectonophysics, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Mattioli, G S
EM: mattioli@uark.edu
AF: Geodesy, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Mattioli, G S
EM: mattioli@uark.edu
AF: Tectonophysics, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Jansma, P E
EM: pjansma@uark.edu
AF: Geodesy, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AU: Jansma, P E
EM: pjansma@uark.edu
AF: Tectonophysics, Purdue University Department of Earth and Atmospheric Sciences 550 Stadium Mall Drive, West Lafayette, IN 47907
AB: Mechanical coupling at convergent plate boundaries has been related to the occurrence of large earthquakes, to upper plate deformation, or to strain partitioning. In the northeastern Caribbean, GPS and earthquake slip vector data suggests along-strike variations in interplate coupling between the North American and Caribbean plates. Subduction in Puerto Rico and in the Lesser Antilles appears to be poorly coupled, whereas subduction/collision under Hispaniola appears to be highly coupled, with the development of large strike-slip faults in the upper plate and the occurrence of large - and potentially very damaging - earthquakes such as the 1946-53 sequence that struck NE Hispaniola. We present new results on interplate coupling in the northeastern Caribbean from GPS geodesy and slip vector data. The results are based on a combined GPS velocity field covering the entire northeastern Caribbean, with new data from Haiti. We model the resulting velocities as the contribution of block rotations and elastic strain accumulation on active faults. We allow for partial coupling on the interplate contact. The model parameters (block angular velocities, fault slip rates, and interplate coupling) are estimated by inverting the GPS and slip vector data.
DE: 6924 Interferometry (1207, 1209, 1242)
SC: Geodesy [G]
MN: Fall Meeting 2005