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abstract: This marine geophysical survey took place from 03/05/1992 – 10/07/1992 in the Rockall Continental Margin on board the Kommandor Michael. The survey was carried out by the British Geological Survey (BGS). The aim of the survey was to investigate the shallow seismic structure along the eastern margin of the Rockall Bank, Northern Rockall Trough and adjacent banks. Sub bottom seismic profiling data were collected using Airgun, Sparker and Deep Tow Boomer systems. Gravity and Magnetic data were also acquired. These data are archived by BGS. Technical details of the survey are contained in BGS Technical Report WB/92/20C. Brett, CP and Dobinson, A. 1992. Rockall Continental Margin Project. Operations Report. GeoIndex Offshore - https://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=1992/1_RCK.
end date est: Real
cruise: 1992/1_RCK
additional info: Airgun: Source: Cluster array of 4x40 cu in Bolt 600B airguns with wave shape kits, towed at a depth of 2 metres. Number of guns fired selectable but normally all 4 guns used over the majority of the area, reducing to 2 or 1 in the shallow water over the banks. Hydrophone: 24 channel Teledyne T178 with 2 active sections each 75 m in length with a group interval of 6.25m and a 50m stretch section. Channels were summed in groups of 4 to give 6x25m channels. Without active depth controllers the tow depth varied in the range 3.5 to 5m, depending on conditions. Back-up 30m Geomecanique single channel, used on lines 1-3. Sparker: Source: EG&G 9 x multitip array powered by two 232A power supplies and two 231A triggered capacitor banks. Normal operating power was 2000J and firing rate varied from 1 to 3 times during the 10 sec airgun cycle, depending on water depth. Hydrophone: 30m Geomecanique single channel. Deep Tow Boomer: Source: BGS developed deep towed fish based on a Huntec boomer plate. Normal operating power 0.5 kJ to a tow depth of 800m. Hydrophone: short, lm, multi-element array towed behind the fish. Gravity: La Coste and Romberg S75 air-sea gravity meter updated to incorporate a minicomputer for system control and logging of data. Also outputs data to the Qubit Trac IV logging system. Harbour base ties provided using a Worden land meter. Preliminary data reduction was carried out using the BGS PC based processing package to produce crossover errors for data quality control. Magnetics: Barringer M123 marine proton magnetometer with two pen analogue recorder. Data also output digitally to the Qubit Trac IV logging system. Bathymetry: Atlas Deso 20 with narrow beam deep water 33kHz transducer rated to 2200m. Data also output digitally to the Qubit Trac IV logging system. In deep water the first airgun return was digitised to give a depth input to the logging system. Positioning System: VERIPOS differential GPS system hired from Brown and Root Survey. The system w…
confidentiality: unclassified (open file)
nav equip type: Differential GPS
accessuse restric: unrestricted use, copyright acknowledgement
restitle: Geophysical Survey 1992/1_RCK: Northern Rockall Trough and surrounding shallow water areas (10/05/1992 to 04/07/1992)
geophys equip type: Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer, Sparker
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: RV Kommandor Michael
samp equip type: Grab
terms of use url: http://nationalarchives.gov.uk/doc/open-government-licence/version/3/
client: Rockall Consortium
start date: 1992-05-03T00:00:00
contractor: Rockall Consortium
start date est: Real
cruise data url: http://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item175091
cruise area: CP2 Regional Sea Boundaries: Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel, Scottish Continental Shelf, Offshore 1:250k: Anton Dohrn, Darwin, Geikie, George Bligh Bank, Harker, Hebrides Terrace, Kennedy, McCallien, Peach, Rockall Island, Rosemary Bank, St Kilda, Offshore 1:500k: Central Hatton, Central Rockall Basin, North Hatton, North Rockall Basin, SeaVoX Sub-Ocean: NORTHEAST ATLANTIC OCEAN (40W)
end date: 1992-07-10T00:00:00
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