Geophysical and Geodetic Studies of Bedrock, Permafrost and Continental Ice in Queen Maud Land, Antarctica
During the austral summers 1993–1994 and 1997–1998 the Finnish geophysical subgroup in expedition teams ‘Finnarp 93/94 and 97/98 ’ carried out geophysical and geodetic investigations in Western Queen Maud Land, Antarctica. The area studied belongs to the Vestfjella mountains near the Finnish base st...
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| Format: | Text |
| Language: | English |
| Published: |
2009
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.625.9861 http://www.geophysica.fi/pdf/geophysica_2009_45_1-2_063_ruotoistenmaki.pdf |
| Summary: | During the austral summers 1993–1994 and 1997–1998 the Finnish geophysical subgroup in expedition teams ‘Finnarp 93/94 and 97/98 ’ carried out geophysical and geodetic investigations in Western Queen Maud Land, Antarctica. The area studied belongs to the Vestfjella mountains near the Finnish base station Aboa (73º03'S, 13º25'W). The aim of the geophysical and geodetic measurements was to study the characteristics of ice, permafrost and bedrock geology between the nunataks. In this study is given results of the geophysical and glaciological investigations on a ca. 38 km long profile between nunataks Basen and Fossilryggen. Using gravity and magnetic methods connected with petrophysical data we interpreted litholocigal variations in bedrock on nunataks and under continental ice. Using electromagnetic sounding methods we obtained information of conductivity variations in the ice and underlying bedrock. When permafrost is present in bedrock, its geometry can be determined by defining the depth variations of the conductive layer of saline waters enriched below permafrost. These measurements can further be used for estimating temperature variations in bedrock and ice. The velocity vectors of the ice were determined using high precision differential GPS. The |
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