Bedrock Motions From a Decade of GPS Measurements in Southern Victoria Land, Antarctica.

Details Bedrock Motions From a Decade of GPS Measurements in Southern Victoria Land, Antarctica. Bedrock Motions From a Decade of GPS Measurements in Southern Victoria Land, Antarctica.

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.g33b0059w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #G33B-0059

Physics

1223 Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 1225 Global Change From Geodesy (1222, 1622, 1630, 1641, 1645, 4556), 1236 Rheology Of The Lithosphere And Mantle (7218, 8160), 1240 Satellite Geodesy: Results (6929, 7215, 7230, 7240), 1645 Solid Earth (1225)

Scientific paper

A decade of GPS data has been used to derive strongly constrained bedrock motions over southern Victoria Land, Antarctica. The measurements have been made from 74°S at Terra Nova Bay to 82°S at the Byrd Glacier and have bracketed the most easterly and westerly outcrops of bedrock available. Station spacing is ~70km with the network covering about 250,000 km2. The data have been processed independently using different methodologies in the PAGES and BERNESE software packages. The results have been blended to make robust solutions of vertical motions due to GIA. Uncertainties are better than ±1.5 mm/yr on all vertical motions and ±0.7 mm/yr for the horizontal. The bedrock motions are compared to Earth models with varying rheologies driven by established ice histories. These models indicate that the mantle below southern Victoria Land is weaker than that observed under cratonic crust, as expected by the presence of active volcanism and recent rifting in the area. The motions are being used to examine the ice loss history for the region.

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