期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 13, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL088148
关键词
Distributed Acoustic Sensing (DAS); Vertical Seismic Profile (VSP); Greenland Ice Sheet; anisotropy; subglacial sediment; borehole surveying
资金
- European Research Council [683043]
- HERCW/Aberystwyth University Capital Equipment Grant
- Natural Environment Research Council Doctoral Training Partnership studentships [NE/L002507/1]
- NERC [NE/K006126/1] Funding Source: UKRI
- European Research Council (ERC) [683043] Funding Source: European Research Council (ERC)
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.
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