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

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 exp...

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Main Authors: Diez, Anja (Author) , Eisen, Olaf (Author) , Hofstede, Coen (Author) , Bohleber, Pascal (Author) , Polom, Ulrich (Author)
Format: Article (Journal)
Language:English
Published: 2013
In: Annals of Glaciology
Year: 2013, Volume: 54, Issue: 64, Pages: 201-210
ISSN:1727-5644
DOI:10.3189/2013AoG64A200
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3189/2013AoG64A200
Verlag, lizenzpflichtig, Volltext: https://www.cambridge.org/core/journals/annals-of-glaciology/article/joint-interpretation-of-explosive-and-vibroseismic-surveys-on-cold-firn-for-the-investigation-of-ice-properties/F9D8F578733FA9E802F5D8FE494FB6B8
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Author Notes:Anja Diez, Olaf Eisen, Coen Hofstede, Pascal Bohleber, Ulrich Polom

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520 |a 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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