https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/171
type: Place
id: 171.0
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cruise id: 171.0
cruise: 1979/14
restitle: Geophysical Survey 1979/14: Shetland (10/07/1979 to 14/08/1979)
ship: MV Sperus
client: British Geological Survey
contractor: British Geological Survey
cruise area: CP2 Regional Sea Boundaries: Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel, Northern North Sea, Scottish Continental Shelf, Offshore 1:250k: Bosies Bank, Bressay Bank, Caithness, Cormorant, Fair Isle, Flett, Foula, Halibut Bank, Judd, Miller, Orkney, Peterhead, Rona, Sando Bank, Shetland, Offshore 1:500k: Faroe Shetland Basin, SeaVoX Sub-Ocean: NORTH SEA, NORTHEAST ATLANTIC OCEAN (40W), NORWEGIAN SEA
abstract: Report: Armstrong, EJ. 1979. Cruise Report for Project 79/14, West Shetland and Project 79/15, Bosies Bank. (IGS Report No 101). Project 79/14 was designed to provide regional geophysical coverage of the Foula sheet, of the IGS 1:250000 map series, on a N-S, E-W grid of lines at approximately 15km by 9 km spacing. A number of gravity lines were also to be run over the Orkney sheet to complete gravity coverage in that area. In addition, some regional geophysical lines were to be surveyed on the Halibut Bank sheet after a study of the FLAGS pipeline route with the Huntec deep tow boomer. The watergun provided superior records to those of the airgun giving resolution comparable to the sparker in fair weather, down to 800ms of sediments. Up to 400ms penetration was achieved by the sparker, while the boomer provided good resolution in the shallow section. In depths less than 300m the transit sonar was used.
additional info: Navigation: Magnavox satellite navigation system integrated with MX 610 doppler sonar. Decca Mk21 Main Chain. Equipment: Bolt 40, 20 and 10 cu.in airguns. Huntec deep tow boomer. Atlas Deso 10 echo sounder with hull mounted transducer and digital readout unit (Edig 10). LaCoste & Romberg air-sea gravity meters S75 and S40 (legs 1 and 2 only) with Monitor Labs 9400 data acquisition system. Two Barringer magnetometers. Edo Western 248 pinger with hull mounted transducers. IGS multi-element spark array and EG&G 9 candle and 3 candle spark arrays. MS47 side scan sonar. Sodera 80 cu.in watergun. Two 30m Geomechanique hydrophones and one 50m Geomechanique hydrophone. For more detailed information see the Cruise Report.
nav equip type: Decca Main Chain, Transit satellite
geophys equip type: Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sparker, Transit Sonar, Water Gun
start date: 1979-07-10T00:00:00
start date est: Estimated
end date: 1979-08-14T00:00:00
end date est: Estimated
confidentiality: unclassified (open file)
accessuse restric: unrestricted use, copyright acknowledgement
terms of use: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced British Geological Survey materials "Contains British Geological Survey materials ©UKRI [year]"
terms of use url: http://nationalarchives.gov.uk/doc/open-government-licence/version/3/
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