Preprints
https://doi.org/10.5194/egusphere-2023-2774
https://doi.org/10.5194/egusphere-2023-2774
19 Dec 2023
 | 19 Dec 2023

Brief communication: On the potential of seismic polarity reversal to detect a thin low-velocity layer above a high-velocity layer in ice-rich rock glaciers

Jacopo Boaga, MIrko Pavoni, Alexander Bast, and Samuel Weber

Abstract. Seismic refraction tomography is a commonly used technique to characterize rock glaciers, as the boundary between unfrozen and ice-bearing layers represents a strong impedance contrast. In several rock glaciers, we observed a reversed polarity of the waves refracted by an extended ice-bearing layer compared to direct wave arrivals. This phase change is due to the presence of a thin low-velocity, i.e. fine- to coarse-grained sediments with ice, above a thicker high-velocity ice layer. Our results are confirmed by modelling and analysis of synthetic seismograms to demonstrate that the presence of a low-velocity layer produces a polarity reversal on the seismic gather.

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Journal article(s) based on this preprint

16 Jul 2024
Brief communication: On the potential of seismic polarity reversal to identify a thin low-velocity layer above a high-velocity layer in ice-rich rock glaciers
Jacopo Boaga, Mirko Pavoni, Alexander Bast, and Samuel Weber
The Cryosphere, 18, 3231–3236, https://doi.org/10.5194/tc-18-3231-2024,https://doi.org/10.5194/tc-18-3231-2024, 2024
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Short summary
Reversal polarity are observed in rock glacier seismic refraction tomography. We collected...
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