2007 Joint Assembly          
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Cite abstracts as Author(s) (2007), Title, Eos Trans. AGU,
(23), Jt. Assem. Suppl., Abstract xxxxx-xx
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kreemer and sc=geodesy

HR: 10:50h
TI: Detection of postseismic relaxation from the 1999 Hector Mine earthquake in southern Basin and Range GPS time series
AU: Kreemer, C
EM: kreemer@unr.edu
AF: University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557-0178, United States
AU: * Hammond, W C
EM: whammond@unr.edu
AF: University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557-0178, United States
AU: Plag, H
EM: hpplag@unr.edu
AF: University of Nevada, Reno, 1664 N. Virginia Street, Reno, NV 89557-0178, United States
AB: We present evidence for the detection of postseismic relaxation from the 1999 M 7.1 Hector Mine earthquake in the non-linearity of time series from the southern BARGEN GPS network. It is important to understand and quantify the transient contributions owing to earthquake cycle effects near the Yucca Mountain nuclear waste repository because these data are used to estimate interseismic secular strain increase that could eventually be released in earthquakes. Most sites from the 35 site continuous GPS network, in operation since 1999, lie over 200 km from the earthquake. However, some of these time series exhibit significant curvature and spatial variation that is similar to the predictions of models of postseismic viscoelastic relaxation following the recent Mojave Desert earthquakes. Central in our analysis is our attempt to distinguish between the expected non-linear signal in the time-series and the network-wide common-mode signals that can occur over similar times-scales as the postseismic signal. We discuss various regional filtering approaches and show their impact on our ability to infer the postseismic relaxation parameters. One such approach investigates time series cross-correlations, which can help distinguish between network-wide common-mode and spatially coherent regional signals predicted by geophysical models. In order to place stronger constraints on the postseismic decay-time, and to better evaluate the significance and correctness of the postseismic displacement field, we estimate a transient component in the time-series of a large number of SCIGN and BARGEN sites. The use of near- and far-field data allows us to infer whether the near- and far-field postseismic deformation signals are significant differently from each other and what that can tell us about the underlying postseismic processes.
UR: http:geodesy.unr.edu
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1236 Rheology of the lithosphere and mantle (7218, 8160)
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1242 Seismic cycle related deformations (6924, 7209, 7223, 7230)
SC: Geodesy [G]
MN: 2007 Joint Assembly

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