HR: 14:00h
AN: T12E-02 INVITED     [PDF]
TI: Estimates of slip rates on Bay Area faults from space geodetic data
AU: * D'Alessio, M A
EM: dalessio@seismo.berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science 307 McCone Hall, Berkeley, CA 94720-4767 United States
AU: Schmidt, D A
EM: das@darkwing.uoregon.edu
AF: University of Oregon, Department of Geological Sciences, Eugene, OR 97403-1272 United States
AU: Johanson, I A
EM: ingrid@seismo.berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science 307 McCone Hall, Berkeley, CA 94720-4767 United States
AU: B\"urgmann, R
EM: burgmann@seismo.berkeley.edu
AF: University of California, Berkeley, Department of Earth and Planetary Science 307 McCone Hall, Berkeley, CA 94720-4767 United States
AB: In an effort to put together the most comprehensive picture of crustal deformation in the San Francisco Bay Area, The UC Berkeley Active Tectonics Group has created the Bay Area Velocity Unification (B\={A}V\={U}, ``Bay-View"). This dataset unites campaign and continuous GPS data for nearly 180 GPS stations throughout the greater San Francisco Bay Area from Sacramento to San Luis Obispo. We have reprocessed and combined data collected by six agencies between 1991 and 2003 using a uniform methodology with the GAMIT/GLOBK software package. B\={A}V\={U} has 88 GPS stations in the eastern San Francisco Bay Area with 64 of those within 15 km of the Hayward fault. GPS data are complemented by InSAR range-change rates estimated from a stack of $>$ 20 interferograms spanning 1992-2002. Where we can compare the data sets directly, they agree within the reliability of each method. We use the consistent velocity field from B\={A}V\={U} to quantify fault slip rates and strain accumulation using a 3-D elastic dislocation model of the San Francisco Bay Area, as well as more a detailed inversion for the creep rate on the Hayward fault. We find that the estimated rates of slip deficit accumulation are mostly consistent with geologic estimates of fault slip rates. On the Hayward fault, creep rates vary along strike and are temporally complex.
UR: http://seismo.berkeley.edu/~burgmann/research/BAVU
DE: 1208 Crustal movements--intraplate (8110)
DE: 1243 Space geodetic surveys
DE: 7223 Seismic hazard assessment and prediction
DE: 8010 Fractures and faults
DE: 8020 Mechanics
SC: Tectonophysics [T]
MN: 2003 Fall Meeting