Summary Gravity and GPS measurement as well as accompanying ice thickness determinations were performed along a tractor traverse from Patriot Hills to the South Pole, covering a distance of more than 1100 km. Special con-siderations were necessary to reasonably calculate the drift of the gravimeter...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.3817 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea012.pdf |
| Summary: | Summary Gravity and GPS measurement as well as accompanying ice thickness determinations were performed along a tractor traverse from Patriot Hills to the South Pole, covering a distance of more than 1100 km. Special con-siderations were necessary to reasonably calculate the drift of the gravimeter used. Bouguer and ice layer corrections were accomplished by two-dimensional model calculations. The resulting complete Bouguer anomaly oscillates around zero along the northern section of the profile and starts to decrease 200 to 300 km before entering the East-Antarctic craton where it stabilizes at about-130 mGal. Isostatic modelling yields a positive residual anomaly of about 70 mGal over East-Antarctica which can be explained by additional masses in the crust, e.g. assuming an in-creased density in the lower crust. Alternative models which incorporate lighter sediments in West-Antarctica or which are isostatically unbalanced are conceivable. |
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