HR: 08:15h
AN: G51D-02 INVITED     [Abstracts]
TI: Lower Crustal Transients and Surface Mass Transport: Time Series Filtering for Signal Detection at Two Spatial Extremes.
AU: * Blewitt, G
EM: gblewitt@unr.edu
AF: Nevada Bureau of Mines & Geology, and Seismological Laboratory, University of Nevada, Reno, NV 89557 United States
AB: Two examples are presented of GPS time series filtering at two spatial extremes: (1) the recent discovery of a lower-crustal transient event by filtering out "common mode" errors and seasonal signals [Smith et al., Science, 305, 2004]; and (2) the detection of global-scale surface mass transport by use of spherical harmonics to smooth through local- to regional-scale noise [Gross et al., GRL, 31, 2004]. These examples illustrate the paradigm that one geodesist's noise is another's signal. Specific attention is given to the actual methodology applied to extract the signals of interest at these two spatial extremes, starting at the level of the actual GPS data processing, through to time series analysis, with a discussion on relevant reference frame issues.
DE: 8434 Magma migration
DE: 1208 Crustal movements--intraplate (8110)
DE: 1213 Earth's interior--dynamics (8115, 8120)
DE: 1247 Terrestrial reference systems
DE: 1294 Instruments and techniques
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting