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Inferring Geoid Change from Vertical Crustal Motion

Inferring Geoid Change from Vertical Crustal Motion. Richard Snay NOAA’s National Geodetic Survey October 21, 2009. Determining Vertical Crustal Velocities.

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Inferring Geoid Change from Vertical Crustal Motion

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  1. Inferring Geoid Change from Vertical Crustal Motion Richard Snay NOAA’s National Geodetic Survey October 21, 2009

  2. Determining 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.

  3. CORS Network

  4. CORS for Monitoring Vertical Crustal Motion Vertical velocities associated with Glacial Isostatic Adjustment

  5. Tide Gauges Located Near a CORS Whose Vertical Crustal Velocity Has Been Accurately Determined CORS-calibrated tide gauge data indicate that the rate of sea level rise around North America was 1.8 +/- 0.2 mm/yr during the 1900-1999 time interval

  6. Vertical Motion Associated with Subduction Hyndman and Wang, 1994

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