caa a22 4500 445364823 CHVBK 20180317142926.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s11001-011-9115-3 doi (NATIONALLICENCE)springer-10.1007/s11001-011-9115-3 A high-resolution, multi-channel, over-sea-ice seismic reflection survey over the Mackay Sea Valley, Granite Harbor, Antarctica [Elektronische Daten] [B. Williams, M. Speece, R. Powell] In the austral summer of 2007, 20.5km 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 25m apart. Unique problems in the over-sea-ice seismic reflection survey—noise from the ice column flexing and timing delays caused by trapped air at previous shot points—were overcome to improve the quality of the seismic data. The Mackay Sea Valley survey produced seismic data with a vertical resolution of 6.3m. The processed seismic data show pelagic sediment thickness of up to 50m within the Mackay Sea Valley with some locations showing possible older sediments beneath the pelagic sediment layer. Springer Science+Business Media B.V., 2011 Antarctic nationallicence High-resolution nationallicence Over-sea-ice nationallicence Reflection nationallicence Seismic nationallicence Williams B. Geophysical Engineering Department, Montana Tech, 1300 West Park Street, 59701, Butte, MT, USA aut Speece M. Geophysical Engineering Department, Montana Tech, 1300 West Park Street, 59701, Butte, MT, USA aut Powell R. Department of Geology and Environmental Geosciences, Northern Illinois University, 60115, DeKalb, IL, USA aut Marine Geophysical Research Springer Netherlands 32/3(2011-09-01), 383-395 0025-3235 32:3<383 2011 32 11001 https://doi.org/10.1007/s11001-011-9115-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11001-011-9115-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Williams B. Geophysical Engineering Department, Montana Tech, 1300 West Park Street, 59701, Butte, MT, USA aut NATIONALLICENCE 700 1- Speece M. Geophysical Engineering Department, Montana Tech, 1300 West Park Street, 59701, Butte, MT, USA aut NATIONALLICENCE 700 1- Powell R. Department of Geology and Environmental Geosciences, Northern Illinois University, 60115, DeKalb, IL, USA aut NATIONALLICENCE 773 0- Marine Geophysical Research Springer Netherlands 32/3(2011-09-01), 383-395 0025-3235 32:3<383 2011 32 11001 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer