https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/175
type: Place
id: 175.0
prev: 174.0
next: 176.0
client: British Geological Survey
start date: 1979-04-27T00:00:00
contractor: British Geological Survey
start date est: Estimated
cruise area: CP2 Regional Sea Boundaries: Southern North Sea, Offshore 1:250k: East Anglia, Flemish Bight, Indefatigable, Ostend, Spurn, Thames Estuary, SeaVoX Sub-Ocean: NORTH SEA
end date: 1979-07-03T00:00:00
abstract: Report: Armstrong, EJ. 1979. Cruise Report for Project 79/02 and Project 79/16. (IGS Report No 100).
end date est: Estimated
cruise: 1979/2
additional info: Navigation: Magnavox satellite navigation system integrated with MX 610 doppler sonar. Decca Mk21 Main Chain. Equipment: Atlas Deso 10 echo sounder with digital readout unit (Edig 10). LaCoste & Romberg air-sea gravity meter S75 with LaCoste & Romberg 9400 data acquisition system. Two Barringer magnetometers. Edo Western 248 pinger with hull mounted transducers. IGS multi-element spark array and EG&G 9 candle and 3 candle spark arrays. Two 30m Geomechanique hydrophones and one 50m Geomechanique hydrophone. Project 79/16 was designed to provide regional geophysical coverage of the south North Sea in the British sector between 52N and 53.5N on a primarily NS-EW grid of lines at approximately 7.5km by 9km spacing. The information obtained from the shallow seismic equipment was to be used as a basis for drilling and sampling by IGS, CSSU later in the year. Gravity and mangetic equipment were also carried to supplement work carried out in 1978. The 4kJ and 800J sparkers were run for most of the second leg, giving penetration of up to 700m and 150m respectively, with approximately 8m resolution on the 800J records. During the third leg the 1kJ sparker was run as an alternative on a number of lines. During leg 4, the 500J sparker gave penetration of up to 100m with improved reflector resolution over previous legs. The 4kJ sparker worked well though mains interference marred some lines. The pinger provided good definition in the top 20m below seabed and enabled the tracing of two major channel systems across the survey area. 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 1979/2: Southern North Sea (27/04/1979 to 03/07/1979)
geophys equip type: Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Pinger, Sparker, Transit Sonar
terms of use: 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]"
ship: MV Sperus
terms of use url: http://nationalarchives.gov.uk/doc/open-government-licence/version/3/
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