HR: 11:20h
AN: S11H-05 INVITED     [PDF]
TI: Kinematic and Dynamic Rupture Models of the November 3, 2002 Mw7.9 Denali, Alaska, Earthquake
AU: * Dreger, D S
EM: dreger@seismo.berkeley.edu
AF: UC Berkeley, 281 McCone Hall, Berkeley, CA 94720 United States
AU: Oglesby, D
EM: doglesby@namazu.ucr.edu
AF: UC Riverside, Geology Building 454, Riverside, CA 92521 United States
AU: Harris, R
EM: harris@usgs.gov
AF: US Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 United States
AU: Ratchkovski, N
EM: natasha@eq.giseis.alaska.edu
AF: Geophysical Institute, University of Alaska, Fairbanks 903 Koyukuk Drive, P.O. Box 757320, Fairbanks, AK 99775 United States
AU: Hansen, R
EM: roger@eq.giseis.alaska.edu
AF: Geophysical Institute, University of Alaska, Fairbanks 903 Koyukuk Drive, P.O. Box 757320, Fairbanks, AK 99775 United States
AB: Regional seismic waveforms, continuous and campaign-mode GPS data, and surface slip measurements were used to obtain a kinematic model of the rupture process of the November 3, 2002 Mw7.9 Denali, Alaska, earthquake. The event initiated as a Mw7.0 reverse slip event on the north-dipping Susitna Glacier fault with subsequent right-lateral slip distributed over approximately 300 km of the Denali fault system. Near-shear rupture velocity was inferred from direct measurement of S-wave arrival time and the kinematic modeling. The average and maximum slips were found to be 2.14 m and 9.94 m. Static stress drop varies from 1 to 5.2 MPa over the 5-segment fault model. Dynamic modeling shows the rupture propagated along the Susitna Glacier and Denali faults then transferred to the Totschunda fault, before stopping. The transfer from the Denali to the Totschunda faults is due to the Totschunda's more favorable orientation with respect to the regional stress field.
DE: 7209 Earthquake dynamics and mechanics
DE: 7212 Earthquake ground motions and engineering
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2003 Fall Meeting