https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/195
type: Place
id: 195.0
prev: 194.0
next: 196.0
client: British Geological Survey
start date: 1981-08-20T00:00:00
contractor: British Geological Survey
start date est: Estimated
cruise area: CP2 Regional Sea Boundaries: Eastern Channel, Southern North Sea, Western Channel & Celtic Sea, Offshore 1:250k: Caen, Dungeness-Boulogne, East Anglia, Flemish Bight, Guernsey, Lands End, Lizard, Ostend, Portland, Rouen, Thames Estuary, Wight, SeaVoX Sub-Ocean: DOVER STRAIT, ENGLISH CHANNEL, NORTH SEA
end date: 1981-09-19T00:00:00
abstract: Report: Brett, CP. 1981. Operations Report on Project 81/05. A Geophysical Survey in the Eastern English Channel. (IGS Report No 121) There were two objectives of this project, the first being to complete the regional survey of the Dungeness-Boulogne sheet of the IGS 1:250000 map series. The second objective was to carry out a gravity and megnetic survey in the Caen and Rouen sheets, in order to complete the gravity coverage of the entire English Channel. A secondary objective was to run a few isolated gravity lines in Bournemouth Bay and off Dartmouth to fill in small gaps in the existing data.
end date est: Estimated
cruise: 1981/5
additional info: Navigation: Magnavox satellite navigation system integrated with MX610 doppler sonar and Arma Brown Mk I Mod 5 gyro compass. Dacca Mk 21 main chain receiver - optional integration with above. Equipment: Bolt 600B air gun, two guns with standard (1-40 cu.in.) range of chamber sizes, Krohn-hite bandpass filter, TSS Model 307 TVG amplifier and display on an EPC 3200 graphic recorder, Geomecanique hydrophone system. Atlas Deso 10 echo sounder with hull mounted transducers (33 and 210KHz) and Edig 10 digitiser unit. LaCoste & Romberg S75 air-sea gravity meter. World Wide land gravity meter for base ties. Varian proton magnetometer. Edo Western 248 pinger, 3.5 KHz, 10KW transducer in tow fish assembly. Used with TSS Model 302 swell filter, display on EPC graphic recorder. Huntec deep tow boomer system with remote contrilled winch, Krohn-hite bandpass filter and display on an EPC 3200 graphic recorder. EG&G sparker system, with up to 5kJ capability. One 3-element and one 9-element spark array, Krohn-hite bandpass filter, TSS Model 307 TVG amplifier, TSS Mobel 302 swell filter and display on an EPC 4600 or EPC 3200 graphic recorder, Teledyne hydrophone system. UDI AS350 dual channel side scan sonar system with catamaran tow fish, 2500ft tow cable and remote controlled winch. Display on an EPC 3200 graphic recorder and firing sequence controlled by the seismic control 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 1981/5: Eastern English Channel (20/08/1981 to 19/09/1981)
geophys equip type: Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sidescan Sonar, Sparker
terms of use: Varying conditions apply
ship: RRS Shackleton
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