Inferring Geoid Change from Vertical Crustal Motion

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Inferring Geoid Change from Vertical Crustal MotionRichard SnayNOAA’s National Geodetic SurveyOctober 21, 2009Determining Vertical Crustal VelocitiesNGS is computing…
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Inferring Geoid Change from Vertical Crustal MotionRichard SnayNOAA’s National Geodetic SurveyOctober 21, 2009Determining Vertical Crustal Velocities
  • NGS is computing vertical crustal velocities for sites in the U.S. CORS network by reprocessing all pertinent GPS data collected since 1994.
  • These velocities will be expressed relative to ITRF2008, and they should be available by the fall of 2010.
  • Understanding the underlying physics (glacial isostatic adjustment, fluid withdrawal, subduction, etc.) will be critical for relating these crustal velocities to geoid change.
  • CORS NetworkCORS for Monitoring Vertical Crustal MotionVertical velocities associated with Glacial Isostatic Adjustment Tide Gauges Located Near a CORS Whose Vertical Crustal Velocity Has Been Accurately DeterminedCORS-calibrated tide gauge dataindicate that the rate of sea level rise around North America was 1.8 +/- 0.2 mm/yr during the 1900-1999 time intervalVertical Motion Associated with SubductionHyndman and Wang, 1994
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