HR: 1330h
AN: T43D-05    [Abstracts]
TI: Architecture of the Northwest Andean Microplates
AU: * Potts, L V
EM: potts.3@osu.edu
AF: Laboratory of Space Geodesy and Remote Sensing Research, The Ohio State University, 470 Hitchcock Hall 2070 Neil Avenue, Columbus, OH 43210 United States
AU: Hernandez, O
EM: hernandez.135@osu.edu
AF: Department of Geological Department of Gological Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 S. Oval Mall, Columbus, OH 43210 United States
AU: von Frese, R R
EM: hernandez.135@osu.edu, vonfrese@geology.ohio-state.edu
AF: Department of Geological Department of Gological Sciences, The Ohio State University, 275 Mendenhall Laboratory, 125 S. Oval Mall, Columbus, OH 43210 United States
AU: Schmidt, M
EM: schmidt@dgfi.badw.de
AF: Deutsches Geod„tisches Forschungsinstitut, Marstallplatz 8, Muenchen, 80539 Germany
AB: Recently revised models on global plate boundary zones show that the North Andes microplate includes a wide distribution of seismicity, volcanic events, active faulting and extreme topography. The current description of the north Andean microplate boundaries is interpreted from a variety of geological and geophysical models including volcanism and seismicity with variable confidence levels. The poorly understood complex structure and geometry of plate boundaries limits the ability of current physical models to predict neotectonic and other effects including intra-plate lithospheric stresses and strain. Together with local surface gravity and topography data, a variety of available space geodetic sensors have substantially improved the modeling of the lithosphere for analyzing subsurface mass dynamics. They include the GPS-derived 3-D crustal velocities, high resolution (90-m) topography, seismic surveys and high resolution gravity models derived from integrated satellite (e.g., CHAMP and GRACE, 200-km resolution) and terrestrial observations (up to ~5 km resolution). Spherical wavelets is a modern tool for a multi-resolution representation of spatially heterogenously distributed gravity (consistent with the generalized boundary value problem) and for topography datasets with the distinct ability to enhance localized signals. Analysis of multi-resolution gravity and topography models combined with GPS velocities provide a unique opportunity to characterize the structure, isostatic conditions, mass dynamics, and intra-plate deformations of the North Andes microplate.
DE: 1219 Local gravity anomalies and crustal structure
DE: 8015 Local crustal structure
DE: 8110 Continental tectonics--general (0905)
DE: 9810 New fields (not classifiable under other headings)
SC: Tectonophysics [T]
MN: 2005 Joint Assembly