GPS Velocity Maps (Click for info)

189K	GPS-determined velocity field, Pacific Northwest Geodetic Array (PANGA). This velocity field is plotted relative to North America, as defined by 11 GPS stations in the continental interior and Atlantic passive margin (Table 3). Two to six years of data from continuously operating GPS stations yield PANGA station velocities. Error ellipses show two-dimensional 95% confidence regions. Seafloor topography from Smith and Sandwell [1997].
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79K	Residual PANGA station velocities relative to North America corrected for annualized elastic deformation that results from coupling along the Cascadia subduction zone (see Table 4). The residual velocities partly reflect geologic deformation; other effects are detailed in the text. Faults were compiled from Gower et al. [1985] and Slemmons et al.[1992].
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