https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/211
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id: 211.0
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cruise id: 211.0
cruise: 1984/2
restitle: Geophysical Survey 1984/2: Southern North Sea (22/04/1984 to 28/04/1984)
ship: MV Gorsethorn
client: British Geological Survey
contractor: British Geological Survey
cruise area: CP2 Regional Sea Boundaries: Eastern Channel, Southern North Sea, Offshore 1:250k: Dungeness-Boulogne, East Anglia, Flemish Bight, Indefatigable, Ostend, Silver Well, Thames Estuary, SeaVoX Sub-Ocean: DOVER STRAIT, NORTH SEA
abstract: Report: Brett, CP. 1984. Operations Report on Projects 84/02 and 84/03 Regional Geophysical Surveys in the Southern North Sea, and Project 84/04, a Short Gravity Survey in Norwegian Waters. (IGS Report No 151). The primary objective was to survey aines in Belgian and Dutch waters.
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. Containerised Compare Reavell VHP 36 compressor 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 M123 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. Kelvin Hughes MS47 transit sonar - hull mounted, 2 off - one port and one starboard scanning. Modified for dual operation and display on EPC 3200 recorder. Firing sequence controlled by seismic control system. For more detailed information see the Cruise Report.
nav equip type: Decca Main Chain, Transit satellite
geophys equip type: Airgun/Sleeve Gun, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sidescan Sonar, Sparker, Surface Tow Boomer
start date: 1984-04-22T00:00:00
start date est: Estimated
end date: 1984-04-28T00:00:00
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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