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A High-Resolution, Multi-Channel, Over-Sea-Ice Seismic Reflection Survey Over The Mackay Sea Valley, Granite Harbor, Antarctica, B. Williams, Marvin Speece, Ross Powell
A High-Resolution, Multi-Channel, Over-Sea-Ice Seismic Reflection Survey Over The Mackay Sea Valley, Granite Harbor, Antarctica, B. Williams, Marvin Speece, Ross Powell
M. A Speece
In the austral summer of 2007, 20.5 km of high-resolution over-sea-ice seismic reflection data were collected in the Granite Harbor region of southern McMurdo Sound over the Mackay Sea Valley. The goal of the survey was to image thin pelagic sediment deposited in the Mackay Sea Valley after the Last Glacial Maximum. A generator–injector air gun was lowered beneath the sea ice through holes drilled by an auger drill system. The recording system was a 60 channel snow streamer with vertically oriented gimbaled geophones spaced 25 m apart. Unique problems in the over-sea-ice seismic reflection survey—noise from the ice column …