HR: 09:45h
AN: S11B-06    [PDF]
TI: Early Postseismic Deformation Following the Mw 7.9 Denali Earthquake, 2002, From GPS Measurements.
AU: Larsen, C F
EM: chris@giseis.alaska.edu
AF: Geophysical Institute University of Alaska Fairbanks, 903 Koyuku Dr., Fairbanks, AK 99775 United States
AU: Hreinsdottir, S
EM: sigrun@giseis.alaska.edu
AF: Geophysical Institute University of Alaska Fairbanks, 903 Koyuku Dr., Fairbanks, AK 99775 United States
AU: Freymueller, J T
EM: jeff@giseis.alaska.edu
AF: Geophysical Institute University of Alaska Fairbanks, 903 Koyuku Dr., Fairbanks, AK 99775 United States
AU: Fletcher, H
EM: hilary@giseis.alaska.edu
AF: Geophysical Institute University of Alaska Fairbanks, 903 Koyuku Dr., Fairbanks, AK 99775 United States
AU: * Zimmerman, M
EM: melany@giseis.alaska.edu
AF: Geophysical Institute University of Alaska Fairbanks, 903 Koyuku Dr., Fairbanks, AK 99775 United States
AB: The rapid deployment of GPS receivers following the 3 Nov 2002 Mw 7.9 Denali Fault Earthquake occurred in two phases, with immediate campaign style deployment preceding the installation of new permanent stations. The initial deployment included multi-day to multi-week GPS measurements on existing campaign monuments, as well as on newly established monuments close to where the permanent sites were built. At all of the permanent stations, campaign style measurements from these very nearby points (within 10-20 meters) overlap the start of the permanent station data. Using these survey ties, we can connect the position time-series of these campaign data with the time-series of the associated permanent stations. The resulting records are a unique window into the earliest stages of post-seismic response of a large magnitude strike-slip event. Several stations close to the rupture show initial post-seismic velocities in excess of 2 mm/day. The data allow us to test models of afterslip and poroelastic and/or viscoelastic deformation operating on timescales of days to a month or two following the event.
DE: 1208 Crustal movements--intraplate (8110)
DE: 1236 Rheology of the lithosphere and mantle (8160)
DE: 1242 Seismic deformations (7205)
DE: 8120 Dynamics of lithosphere and mantle--general
SC: Seismology [S]
MN: 2003 Fall Meeting