HR: 10:50h
AN: G12A-03    [Abstracts]
TI: Reconciling interseismic strain and geologic deformation across convergent plate boundaries
AU: Chlieh, M
EM: chlieh@gps.caltech.edu
AF: California Institute of Technology, Tectonics Observatory, Pasadena, CA 91125, United States
AU: * Avouac, J
EM: avouac@gps.caltech.edu
AF: California Institute of Technology, Tectonics Observatory, Pasadena, CA 91125, United States
AU: Bettinelli, P
EM: pierre.bettinelli@gmail.com
AF: Laboratoire de Detection et de Geophysique, CEA, BP 12, Bruyeres-le-Chatel, 91680, France
AU: Flouzat, M
EM: mireille.flouzat@cea.fr
AF: Laboratoire de Detection et de Geophysique, CEA, BP 12, Bruyeres-le-Chatel, 91680, France
AU: Simoes, M
EM: martine.simoes@univ-rennes1.fr
AF: Universite de Rennes, Campus de Beaulieu Geosciences Rennes, Rennes, F-35042, France
AU: Hsu, Y
EM: yaru@earth.sinica.edu.tw
AF: Academia Sinica Taiwan, Institute of Earth Sciences, Taipei, 115-ROC, Taiwan
AU: Perfettini, H
EM: perfetti@lmtg.obs-mip.fr
AF: IRD-Peru, Casilla 18-1209, Lima, 18, Peru
AB: The advent of space geodesy has revolutionized our ability to measure surface displacements and crustal strain along plate boundaries or across deforming continental areas. Some examples from Taiwan, the Nepal Himalaya and Sumatra where geologic, geodetic and plate motion data can be compared will be reviewed in the presentation. It will be shown that the geodetic data can generally be explained reasonably well from a conventional approach within the framework provided by Plate Tectonics and the ‘Seismic Cycle' theory. We will point to clear inconsistencies revealing potential problems with the data or with some the basic assumptions made in this kind of analysis. Temporal strain variations are generally observed in addition to the secular strain expected from the conventional theory of interseismic strain. We will show evidence for seasonal variations probably due to external seasonal forcing, and evidence for longer term temporal variations probably due to internal dynamics. It will be argued that the assumption that interseismic strain is stationary might in fact need be reconsidered. Also we will discuss ways to reconcile geodetic measurements with the build up of geological deformation in the long run, and how geologic studies can help understand better the mechanical processes governing geodetic strain.
DE: 1217 Time variable gravity (7223, 7230)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
DE: 8123 Dynamics: seismotectonics
DE: 8150 Plate boundary: general (3040)
SC: Geodesy [G]
MN: 2007 Fall Meeting