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Titel |
Combined seismic and radar investigation to define ice properties and structure of a cold alpine site |
VerfasserIn |
O. Eisen, P. Bohleber, R. Drews, A. Heilig, C. Hofstede |
Konferenz |
EGU General Assembly 2009
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 11 (2009) |
Datensatznummer |
250021344
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Zusammenfassung |
The cold alpine saddle Colle Gnifetti, Monte Rosa, Swiss-Italian Alps resembles very much
polar and subpolar ice masses in terms of glaciological conditions. It has been the site for
several ice-core drilling campaigns over more than 20 years to determine paleoclimatological
and glaciological conditions. To investigate the feasibility of geophysical methods for
improved characterization of ice masses surrounding borehole and ice-core sites, a
combined active reflection seismic and ground-penetrating radar pilot study has
been carried out in summer 2008. Aims are the characterization of density, internal
layering, seismic and radar wave speed and attenuation, identification of anisotropic
features (like crystal orientation or bubble content and shape). Here we present
the overall setup and first results. Seismic and GPR profiles were centered on an
existing borehole location covering the full ice thickness of 62 m. Active seismics
was carried out with 24-channel 3-m spacing recording, using a Seismic Impulse
Source System (SISSY) along two profiles parallel and perpendicular to the ice-flow
direction. The same profiles were complemented with GPR measurements utilizing
250, 500 MHz frequencies. Additionally, circular profiles with 250, 500 and 800
MHz were carried out circumferencing the borehole to detect anisotropic features. |
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