Geophysical Survey 1980/1: Southern North Sea (21/04/1980 to 30/06/1980)
CP2 Regional Sea Boundaries: Northern North Sea, Southern North Sea, Offshore 1:250k: California, Dogger, East Anglia, Flemish Bight, Humber-Trent, Indefatigable, Ostend, Silver Well, Spurn, Tyne-Tees, SeaVoX Sub-Ocean: NORTH SEA
Report (WB/MG/80/103): Brett, CP. 1980. Cruise Report on Project 80/01 (4 phases, gap between 5-18 June). A Regional Geophysical Survey in the Southern North Sea. (IGS Report No 103). The primary objectives were to complete the geophysical survey of the Indefatigable and Spurn sheets of the IGS 1:250000 map series, and to re-run several line surveyed in 1979 (Project 79/02) on the Flemish Bight sheet. A secondary objective was to run one line along a proposed pipeline route on the California sheet.
Navigation: Magnavox satellite navigation system integrated with MX610/MX600 doppler sonar and Arma Brown Mk I Mod 5 gyro compass. Decca Mk 21 Main Chain - optional integration with above. Equipment: Atlas Desc 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. Barringer proton magnetometer. EG&G sparker system - up to 5KJ capacity, one three element and one nine element spark array, Krohn-hite bandpass filter, TSS Model 307 TGV amplifier, recording on a EPC 4600 graphic recorder. EG&G 263C x2 hydrophones with Teledyne 7 channel (10m) in latter part of the survey. Kelvin Hughes MS47 transit sonar - hull mounted, port scanning. UDI AS350 dual side scan system with catamaran tow fish, 2500ft tow cable and remote controlled winch. Recording on an EPC 3200 graphic recorder. Edo Western 248 pinger, 3.5 kHz, 10kW transducer in tow-fish assembly. Used with TSS Model 302 swell filter. Recording on EPC 4600 graphic recorder. Huntec deep tow boomer system with remote controlled winch, two Krohn-hite bandpass filters, recording on on EPC 4100 graphic recorder. Bolt 600B, two guns with standard (1-40 cu.in.) range of chamber sizes, Krohn-hite bandpass filter, TSS Model 307 TVG amplifier. Geomecanique 30m hydrophone (also a Geomecanique 50m 3 section hydrophone used with the airgun and water gun). Recording on an EPC4600 graphic recorder. For more detailed information see the Cruise Report.
Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sidescan Sonar, Sparker
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