Deformation Model Inversion Dependency on GNSS Series Characteristics
Date: 4/25/2019
Time: 08:30 AM
Room: Puget Sound
Geophysical signals from plate motions, earthquakes and other deforming processes may be used to constrain models of the source and rheology, but this task requires adequate characterization of the observing system. For GNSS time series important characteristics include regional common mode error, temporal correlations, spatially correlated modes from other processes, and background noise. All of these features vary somewhat with the analysis center that supplies the time series. We compute characteristics for public time series supplied by the Jet Propulsion Laboratory, Nevada Geodetic Laboratory, UNAVCO, and Scripps Institute of Oceanography. The different characteristics of each center's time series sets give rise to different tables of coseismic jump and uncertainty at each station, leading to variation in fault slip and uncertainty that is linked to each center's choice of processing steps. Station jump estimates may differ by several mm, and uncertainty estimates by methods that neglect temporal correlation may be less than half of correct values, overconstraining inversions.
We apply these distinct characteristics to fitting models of fault slip from the M6 2004 Parkfield and M5.1 2014 La Habra earthquakes, and the 2012 Brawley Swarm event. The GeoGateway Simplex application will be used for nonlinear inversion, as a representative of inversion processes that process coseismic surface deformation with error ellipses. In this way we illuminate some of the subtle ways the characteristics of processing center time series sets affect geophysical models, providing guidance for selection and mitigation of imperfect observations.
Presenting Author: Jay Parker
Authors
Jay Parker jay.w.parker@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States Presenting Author
Corresponding Author
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Andrea Donnellan andrea@jpl.caltech.edu Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Richard Gross richard.s.gross@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Michael Heflin michael.b.heflin@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Angelyn Moore angelyn.w.moore@jpl.nasa.gov Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, United States |
Deformation Model Inversion Dependency on GNSS Series Characteristics
Category
Advances in Tectonic Geodesy