Geophysical Survey 1980/2: Eastern English Channel (06/06/1980 to 16/06/1980)
CP2 Regional Sea Boundaries: Eastern Channel, Southern North Sea, Offshore 1:250k: Dungeness-Boulogne, Thames Estuary, Wight, SeaVoX Sub-Ocean: DOVER STRAIT, ENGLISH CHANNEL, NORTH SEA
Report: Brett, CP. 1980. Cruise Report on Project 80/02. A Geophysical Survey in the Eastern English Channel. (IGS Report No 104). The main objectives were to delineate the area of Jurassic rocks and other major boundaries to enable them to be tied to previous surveys made for a cross channel power cable from Dungeness to Equihen. The survey also formed a basis for the Dungeness-Boulogne sheet of the IGS 1:250000 map series.
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 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. Barringer proton magnetometer. 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. EG&G sparker system - up to 5KJ capability, one 3-element and one 9-element spark array, Krohn-hite bandpass filter, TSS Model 307 TVG amplifier. EG&G 263C x2 hydrophones with Teledyne 7 channel (10m) in latter part of the survey. Recording on an EPC 4600 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, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sidescan Sonar, Sparker, Transit Sonar
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