https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/210
type: Place
id: 210.0
prev: 209.0
next: 211.0
ship: MV Gorsethorn
client: British Geological Survey
start date: 1983-08-31T00:00:00
contractor: British Geological Survey
start date est: Estimated
cruise: 1983/6
cruise area: CP2 Regional Sea Boundaries: Eastern Channel, Southern North Sea, Offshore 1:250k: East Anglia, Flemish Bight, Ostend, Thames Estuary, SeaVoX Sub-Ocean: DOVER STRAIT, NORTH SEA
end date: 1983-09-18T00:00:00
abstract: Report: Brett, CP. 1984. Operations Report on Project 83/06. A Regional Geophysical Survey in the Southern North Sea. (IGS Report No 139). The primary objective was to survey areas of the Thames Estuary and Ostend sheets of the BGS 1:250,000 map series.
end date est: Estimated
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. 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. For more detailed information see the Cruise Report.
confidentiality: unclassified (open file)
nav equip type: Decca Main Chain, Transit satellite
accessuse restric: unrestricted use, copyright acknowledgement
restitle: Geophysical Survey 1983/6: Southern North Sea (31/08/1983 to 18/09/1983)
geophys equip type: Airgun/Sleeve Gun, Deep Tow Sparker, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sparker, Surface Tow Boomer
terms of use: Varying conditions apply
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