Geophysical Survey 1981/6: Bristol Channel & SW Approaches (21/09/1981 to 29/09/1981)
CP2 Regional Sea Boundaries: Western Channel & Celtic Sea, Offshore 1:250k: Bristol Channel, Haig Fras, Lands End, Lundy, Nymphe Bank, SeaVoX Sub-Ocean: BRISTOL CHANNEL, CELTIC SEA
Report: Brett, CP. 1981. Operations report on Project 81/06. A Regional Geophysical Survey in the Bristol Channel and South West Approaches. (IGS Report No 122) The objectives of this survey were to fill in gaps in the previously surveyed areas in the Bristol Channel and Nymphe Bank sheets of the IGS 1:250000 map series.
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: Huntec deep tow boomer system with remote 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. 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. 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. For more detailed information see the Cruise Report.
Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Sidescan Sonar, Sparker
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