Joint interpretation of explosive and vibroseismic surveys on cold firn for the investigation of ice properties


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Anja.Diez [ at ] awi.de

Abstract

Two seismic surveys were carried out on the high-altitude glacier saddle, Colle Gnifetti, Monte Rosa, Italy/Switzerland. Explosive and vibroseismic sources were tested to explore the best way to generate seismic waves to deduce shallow and intermediate properties (<100 m) of firn and ice. The explosive source (SISSY) excites strong surface and diving waves, degrading data quality for processing; no englacial reflections besides the noisy bed reflector are visible. However, the strong diving waves are analyzed to derive the density distribution of the firn pack, yielding results similar to a nearby ice core. The vibrator source (ElViS), used in both P- and SH-wave modes, produces detectable laterally coherent reflections within the firn and ice column.We compare these with ice-core and radar data. The SH-wave data are particularly useful in providing detailed, high-resolution information on firn and ice stratigraphy. Our analyses demonstrate the potential of seismic methods to determine physical properties of firn and ice, particularly density and potentially also crystal-orientation fabric.



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Scopus/ISI peer-reviewed
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Published
Eprint ID
33379
DOI 10.3189/2013AoG64A200

Cite as
Diez, A. , Eisen, O. , Hofstede, C. , Bohleber, P. and Polom, U. (2013): Joint interpretation of explosive and vibroseismic surveys on cold firn for the investigation of ice properties , Annals of Glaciology, 54 (64), pp. 201-210 . doi: 10.3189/2013AoG64A200


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