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Vibroseismics on ice: First results and implications from Antarctic measurements

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Lambrecht, A. , Mayer, C. , Hofstede, C. , Kristoffersen, Y. , Blenkner, R. , Kindermann, R. , Drews, R. , Jansen, D. , Neckel, N. , Witt, R. and Eisen, O. (2010): Vibroseismics on ice: First results and implications from Antarctic measurements , Alpine Glaciology Meeting, Milano, Italy./26. March. .
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Abstract:

The field work in Antarctica was designed as a first step in developing strategies for a very detailed investigation of the internal structure of the ice sheet around the Dronning Maud Land deep ice core site and Halfvarryggen South of Neumayer Station. Besides extensive tests of ice penetrating radar on grounded ice at Halfvarryggen, an in depth comparison of seismic wave generation by explosives and Vibroseis methods was conducted in the area of Neumayer Station.The internal structure at ice domes often indicates upwarping internal layers in radar surveys (Raymond bumps). The crystal orientation fabric (COF) at larger depths at ice domes is probably highly anisotropic and the associated changes in the impedance contrast should be detectable with seismic methods. The scientific goal was therefore to detect internal seismic reflection horizons, which could later be compared to radar reflection horizons. In addition the expedition also focused on new techniques for seismic data acquisition, using for the first time a conventional vibroseis truck in preparation for a similar study at Kohnen station.

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