Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sidescan Sonar, Sparker
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]"
Geophysical Survey 1981/4: Northern North Sea (26/07/1981 to 16/08/1981)
CP2 Regional Sea Boundaries: Northern North Sea, Southern North Sea, Offshore 1:250k: Bosies Bank, Bressay Bank, California, Cod, Devil's Hole, Fair Isle, Farne, Fisher, Fladen, Forties, Ling Bank, Peterhead, Silver Well, Swallow Hole, Tyne-Tees, SeaVoX Sub-Ocean: NORTH SEA
Report: Brett, CP. 1981. Cruise Report on Project 81/04. A Regional Geophysical Survey in the Northern North Sea. (IGS Report No 120) The primary objectives were to survey the Fladen sheet area of the IGS 1:250000 map series and to run seven north-south lines to complete the coverage of the Forties and Cod shhet areas. A secondary objective was to complete a gravity survey.
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. Huntec deep tow boomer system with controlled winch, Krohn-hite bandpass filter and display on an EPC 3200 graphic recorder. 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, cycling controlled by seismic control to eliminate sparker interference. Edo Western 248 pinger, 3.5KHz, 10KW transducer in tow fish assembly. Used with TSS Model 302 swell filter, 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. Kelvin Hughes MS47 transit sonar with hull mounted, 2 off - one port and one starboard scanning. Modified for dual operation and display on an EPC 3200 recorder. Firing sequence controlled by seismic system. For more detailed information see the Cruise Report.
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