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Abstract
Distributed Acoustic Sensing (DAS) is a new technology in which seismic energy is detected, at high spatial and temporal resolution, using the propagation of laser pulses in a fiber-optic cable. We show analyses from the first glaciological borehole DAS deployment to measure the englacial and subglacial seismic properties of Store Glacier, a fast-flowing outlet of the Greenland Ice Sheet. We record compressional and shear waves in 1,043 m-deep vertical seismic profiles, sampled at 10 m vertical resolution, and detect a transition from isotropic to anisotropic ice at 84% of ice thickness, consistent with the Holocene-Wisconsin transition. We identify subglacial reflections originating from the base of a 20 m-thick layer of consolidated sediment and, from attenuation measurements, interpret temperate ice in the lowermost 100 m of the glacier. Our findings highlight the promising potential of DAS technology to constrain the seismic properties of glaciers and ice sheets.
Original language | English |
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Article number | e2020GL088148 |
Number of pages | 10 |
Journal | Geophysical Research Letters |
Volume | 47 |
Issue number | 13 |
Early online date | 07 Jul 2020 |
DOIs | |
Publication status | Published - 16 Jul 2020 |
Keywords
- Distributed Acoustic Sensing (DAS)
- Greenland Ice Sheet
- Vertical Seismic Profile (VSP)
- anisotropy
- borehole surveying
- subglacial sediment
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Dive into the research topics of 'Distributed Acoustic Sensing of Seismic Properties in a Borehole Drilled on a Fast-Flowing Greenlandic Outlet Glacier'. Together they form a unique fingerprint.Projects
- 1 Finished
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RESPONDER: Resolving subglacial properties, hydrological networks and dynamic evolution of ice flow on the Greenland Ice Sheet (RESPONDER)
Christoffersen, P. & Hubbard, B.
01 Oct 2016 → 30 Sept 2022
Project: Externally funded research