HR: 11:50h
AN: S11H-07    [PDF]
TI: Coseismic Slip Distribution of the Denali Fault Earthquake as Estimated From GPS Measurements.
AU: * Hreinsd\'ottir, S
EM: sigrun@giseis.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., PO Box 757320, Fairbanks, AK 99775-7320 United States
AU: Freymueller, J T
EM: jeff@giseis.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., PO Box 757320, Fairbanks, AK 99775-7320 United States
AU: B\"urgmann, R
EM: burgmann@seismo.berkeley.edu
AF: Department of Earth and Planetary, University of California Berkeley, College of Letters and Science, 307 Mc Cone Hall, Berkeley, CA 94720-4767 United States
AB: On 3 November 2002 an Mw 7.9 earthquake occurred in central Alaska, rupturing portions of the Susitna Glacier, Denali and Totschunda faults. 38 existing GPS points in the interior and south central Alaska were measured within two weeks of the earthquake. In addition 12 permanent GPS sites were operating within 500 km of the epicenter at the time of the earthquake. Inversion of the displacement field indicates that the event was dominated by a complex, right-lateral strike-slip rupture along the Denali fault, with relatively low slip on the western part of the rupture and high slip from about 60 km east of the hypocenter extending to the junction of the Denali and Totschunda faults. In the summer of 2003 many additional sites were surveyed to better estimate the coseismic slip distribution of the earthquake. We will present the new and improved coseismic displacement field and resulting slip distribution. We also investigate the impact of half space versus layered space models on the slip distribution.
DE: 1242 Seismic deformations (7205)
DE: 7209 Earthquake dynamics and mechanics
SC: Seismology [S]
MN: 2003 Fall Meeting