Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data

Details Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data Crustal uplift and sea level rise in northern Cascadia from GPS, absolute gravity, and tide gauge data

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415306m&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 15, CiteID L15306

Physics

7

Geodesy And Gravity: Time Variable Gravity (7223, 7230), Geodesy And Gravity: Seismic Cycle Related Deformations (6924, 7209, 7223, 7230), Geodesy And Gravity: Integrations Of Techniques, Global Change: Sea Level Change (1222, 1225, 4556)

Scientific paper

We combine data from nine GPS, absolute gravity, and tide gauge stations to estimate the relation between sea-level rise, vertical motion, and solid Earth processes in the Pacific Northwest. GPS vertical velocities (in ITRF2000) and absolute gravity rates are well correlated, with a gradient of 0.2 +/- 0.1 μGal mm-1, but show a significant offset of 0.53 +/- 0.30 μGal yr-1 (2.2 +/- 1.3 mm yr-1) (95% confidence). Tide gauge and GPS data indicate a northeast Pacific regional sea-level rise of 1.7 +/- 0.5 mm yr-1, aligned to ITRF2000, or an unlikely regional sea-level fall of -0.5 +/- 0.5 mm yr-1, aligned to absolute gravity. Although we cannot rule out a bias in the GPS reference-frame alignment, our results suggest a possible absolute gravity bias by a long-period mass increase from an unknown near-surface or deep-seated source. The impact of such a mass increase on gravity, vertical motion, and sea level remains to be defined.

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