Diez, Anja; Eisen, Olaf; Hofstede, Coen M; Bohleber, Pascal; Polom, Ulrich (2013): Seismic data from Colle Gnifetti glacie saddle around borehole KCI, Swiss Alps. PANGAEA, https://doi.org/10.1594/PANGAEA.833320, Supplement to: Diez, A et al. (2013): Joint interpretation of explosive and vibroseismic surveys on cold firn for the investigation of ice properties. Annals of Glaciology, 54(64), 201-210, https://doi.org/10.3189/2013AoG64A200
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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.
Diez, Anja; Eisen, Olaf; Weikusat, Ilka; Eichler, Jan; Hofstede, Coen M; Bohleber, Pascal; Bohlen, Thomas; Polom, Ulrich (2014): Influence of ice crystal anisotropy on seismic velocity analysis. Annals of Glaciology, 55(67), 97-106, https://doi.org/10.3189/2014AoG67A002
Latitude: 45.929720 * Longitude: 7.876960
Date/Time Start: 2005-08-28T00:00:00 * Date/Time End: 2005-09-04T00:00:00
Minimum Elevation: 4450.0 m * Maximum Elevation: 4450.0 m
Colle_Gnifetti_KCI * Latitude: 45.929720 * Longitude: 7.876960 * Date/Time Start: 2005-08-28T00:00:00 * Date/Time End: 2005-09-04T00:00:00 * Elevation: 4450.0 m * Recovery: 61.57 m * Location: Colle Gnifetti, Monte Rosa, Swiss Alps * Method/Device: Ice drill (ICEDRILL) * Comment: Institutes involved: Heidelberg University (D) Institute of Environmental Physics (leading institute).
Seismic data from three different sources:
- SISSY detonation cardridges
- ELVIS microvibrator p-wave
- ELVIS microvibrator s-wave
Data were recorded with single-spiked vertical and horizontal component geophones, depending on year. Recording took place in 2008 and 2010.
28 data points