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Two Vertical Seismic Profiles from RESPONDER acquisitions on Store Glacier, Greenland, July 2019
dataset
posted on 2020-10-01, 07:52 authored by Adam BoothAdam Booth, Poul Christoffersen, Charlotte Schoonman, Andy Clarke, Bryn Hubbard, Robert Law, Samuel DoyleSamuel Doyle, Thomas Chudley, Athena ChalariTwo VSP datasets, acquired in July 2019 using a Silixa iDASTM distributed acoustic sensing system. Fibre-optic cable is installed in a vertical borehole, 1043 m deep, on Store Glacier, a fast-flowing outlet of the Greenland Ice Sheet. The survey site (L028) is the drained bed of a supraglacial lake, located at [70.56793°N, 50.08697°W].
The seismic source for both shots is a 7 kg sledgehammer, striking a small polyethylene impact plate. For the zero-offset shot ('RESPONDER_Jul2019_L028_ZO.sgy'), the source is located directly at the borehole top. For the offset-shot ('RESPONDER_Jul2019_L028_300mSouth.sgy'), the source is located 306.4 m south of the borehole top.
Seismic VSP data are sampled every 1 m along the length of the cable. The gauge length of the iDASTM interrogator is 10 m. The time-sampling frequency of the VSP is 4000 Hz. The first trace in the VSP is located at 0 m depth. The VSPs are stacks of ~25 individual shots, and a 20-40-250-500 Hz Ormsby bandpass filter is applied.
The analysis of these data is documented by the authors in the Geophysical Research Letters article "Distributed Acoustic Sensing (DAS) of Seismic Properties in A Borehole drilled on a Fast-Flowing Greenlandic Outlet Glacier".
