Preprints
https://doi.org/10.5194/egusphere-2023-2774
https://doi.org/10.5194/egusphere-2023-2774
19 Dec 2023
 | 19 Dec 2023
Status: this preprint is open for discussion.

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.

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

Status: open (until 03 Mar 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2774', Hansruedi Maurer, 04 Jan 2024 reply
    • AC1: 'Reply on RC1', Jacopo Boaga, 10 Jan 2024 reply
Jacopo Boaga, MIrko Pavoni, Alexander Bast, and Samuel Weber
Jacopo Boaga, MIrko Pavoni, Alexander Bast, and Samuel Weber

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Short summary
Reversal polarity are observed in rock glacier seismic refraction tomography. We collected several datasets observing this phenomena in Switzerland and Italy. This phase change may be due to the presence of a thin low-velocity. 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.