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• W2088698524 abstract "In 1982 an Arctic ice island, 3 km by 7 km and 41 m thick, broke away from the Ward-Hunt Ice Shelf on Ellesmere Island and began drifting southwest with the ocean currents. This island provided a stable platform in the polar pack ice, for the seismic reflection exploration of the Arctic Continental Shelf north of Axel Heiberg Island. A seismic reflection array, consisting of a 107 station, 3.53 km, main arm and a twelve station, 2.4 km, cross arm, was constructed on the island. A set of 6 s common midpoint (CMP) data was recorded from the thirteen shotpoints for each kilometre the island drifted. Each charge, 1 kg of 60% Geogel, was detonated 110 m beneath the ice surface. Over July and August, 1985, a total of 87 sets of shots were recorded. The raw record sections were dominated by very strong low-velocity waves and water layer reverberations. Up to fourteen distinct water bottom multiples are seen in both the raw shot gathers and the CMP-stacked sections. Median, (f–k) and optimum array filters were used along with CMP stacking, deconvolution and common shot gather stacking to reduce the water-bound noise. These processes were tested on both simulation data and the real data. A P-wave travelling through the ice layer dominated most of the first arrivals. First break refraction analysis, where possible, revealed 600–800 m of locally varying shallow sedimentary rock (4–5 km s−1) overlying a higher velocity layer (5.5–6 km s−1). The CMP sections contain numerous short discontinuous reflections indicating a lack of simple structure in the high-velocity rock. The larger (107) fold of the common shot gather stack increased the signal to noise ratio and revealed an extensive, roughly horizontal reflection at a two-way time of 1.6 s. This corresponds to a depth of about 4.2 km and is interpreted as a reflection from the top of the Precambrian basement." @default.
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• W2088698524 date "1990-06-01" @default.
• W2088698524 modified "2023-09-26" @default.
• W2088698524 title "Seismic reflection results from an ice island over the Arctic continental Shelf" @default.
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• W2088698524 doi "https://doi.org/10.1016/0025-3227(90)90083-v" @default.
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