https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/208
type: Place
id: 208.0
prev: 207.0
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cruise id: 208.0
cruise: 1983/4
restitle: Geophysical Survey 1983/4: Northwest of Scotland & Minches (13/06/1983 to 16/08/1983)
ship: MV Gorsethorn
client: British Geological Survey
contractor: British Geological Survey
cruise area: CP2 Regional Sea Boundaries: Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel, Minches & Western Scotland, Scottish Continental Shelf, Offshore 1:250k: Flett, Foula, Great Glen, Judd, Lewis, Little Minch, Orkney, Peach, Rona, Sando Bank, Sula Sgeir, Sutherland, Tiree, Wyville Thomson, Offshore 1:500k: Central Rockall Basin, Faroe Shetland Basin, North Rockall Basin, SeaVoX Sub-Ocean: INNER SEAS OFF THE WEST COAST OF SCOTLAND, NORTHEAST ATLANTIC OCEAN (40W)
abstract: Report: Brett, CP. 1984. Operations Report on Project 83/04. A Regional Geophysical Survey off the Northwest of Scotland. (IGS Report No 137). The primary objective was to survey areas of the Lewis and Sutherland sheets of the BGS 1:250,000 map series. A secondary objective was drawn up for the Minches area, as a poor weather alternative.
additional info: Navigation: Magnavox satellite navigation system integrated with MX610 doppler sonar and Arma Brown Mk1 Mod 5 or Mk 1C gyro compass. Decca Mk21 main chain receiver - optional integration with above. Mk 21 lat-lon convertor. Equipment: Bolt 600B four guns with standard (1-40 cu.in.) range of chamber sizes, wave shape kits for 40 cu.in., BGS firing delay unit for synchronisation, Kemo bandpass filter, TSS 307 TVG amplifier and display on an EPC 4600 or EPC 3200 graphic recorder. Geomecanique 2 channel, 30m hydrophone system. Sodera Mica-T 80 cu.in. watergun, recording as for airgun. Containerised Compare Reavell VHP 36 compressor system. Huntec deep tow boomer/sparker system with remote controlled winch, adaptive processing unit, Krohn-hite bandpass filter and display on EPC 3200 graphic recorder. Teledyne 7 channel, 10m hydrophone system. EG&G Surface tow boomer. Kemo bandpass filter, TSS 307 TVG amplifier, TSS 302 swell filter and display on EPC 3200 graphic recorder. Teledyne 7 channel, 10m hydrophone system. Atlas Deso 10 echo sounder with hull mounted transducers (33 and 210kHz) and Edig 10 digitiser unit. 33kHz channel with selectable 7 or 19 element transducer for deep water operation. LaCoste and Romberg S75 air-sea gravity meter. Worden land gravity meter for base ties. Barringer proton magnetometer - two tow cable sensor assemblies. Cycling controlled by seismic control system to eliminate sparker interference. Edo Western 248 pinger, 3.5/7.0kHz, 10 kW, towed fish transducer. Used with TSS 302 swell filter, display on EPC 3200 graphic recorder. EG&G surface sparker system - up to 2KJ capability. One 3-element and one 9-element spark array, Kemo bandpass filter, TSS 307 TVG amplifier, TSS 302 swell filter and display on EPC 4600 or EPC 3200 graphic recorder. Teledyne 7 channel, 10m hydrophone system. UDI AS 350 dual channel sidescan sonar system with catamtive. 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, Deep Tow Sparker, Echo Sounder, Gravimeter, Magnetometer, Sidescan Sonar, Sparker, Water Gun
start date: 1983-06-13T00:00:00
start date est: Estimated
end date: 1983-08-16T00:00:00
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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