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

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 surv...

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Bibliographic Details
Main Authors: Eisen, Olaf, Hofstede, Coen, Diez, Anja, Kristoffersen, Yngve
Format: Conference Object
Language:unknown
Published: Geophysical Research Abstracts Vol. 15, EGU2013-2887 2013
Subjects:
Halvfarryggen
Neumayer
Antarc*
Online Access:https://epic.awi.de/id/eprint/30528/
https://epic.awi.de/id/eprint/30528/1/EGU2013-2887-2.pdf
http://meetingorganizer.copernicus.org/EGU2013/EGU2013-2887-2.pdf
https://hdl.handle.net/10013/epic.41258
https://hdl.handle.net/10013/epic.41258.d001
Description
Summary: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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