Subglacial geology of Halvfarryggen ice dome, Antarctia, inferred from seismic measurements


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Olaf.Eisen [ at ] awi.de

Abstract

We carried out a combined vibro-explosive seismic survey on Halvfarryggen, a local ice dome south of the German research station Neumayer III. The Vibroseis survey was grid shaped to provide spatial information about the glaciological and geological substructure. The center survey line was also surveyed with explosive reflection and refraction seismic set-ups. The ice bed contact we interpret as a frozen till layer overlaying bedrock. From velocity analysis of refractions seen in far offset data, we obtain a pressure-wave velocity >5000 m/s. We therefore interpret the bedrock as igneous, which supplements previous magnetic and gravimetric data sets.



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Published
Event Details
EGU General Assembly, 07 Apr 2013 - 12 Apr 2013, Vienna.
Eprint ID
30528
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Eisen, O. , Hofstede, C. , Diez, A. and Kristoffersen, Y. (2013): Subglacial geology of Halvfarryggen ice dome, Antarctia, inferred from seismic measurements , EGU General Assembly, Vienna, 7 April 2013 - 12 April 2013 .


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