https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/300
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abstract: This British Geological Survey (BGS) marine geophysical survey took place during August 2003 on the UK Continental Shelf west of the United Kingdom, specifically in the Rockall and Hatton basins on board the Royal Research Ship RRS Discovery (Cruise D273). The purpose of the survey was to gather data to map the regional geology of the area. A total of 1677 km of good quality data were collected. Sea floor data were collected using an echo-sounder. Subsurface data were gathered using a suite of seismic instruments (airgun, sparker and pinger), plus a gravity meter and a magnetometer. Most of the data were recorded digitally, but paper output was also generated. The data are archived by BGS. Technical details of the survey are contained in BGS Internal Report IR/03/177. GeoIndex Offshore - https://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2003_1&.
end date est: Real
cruise: 2003/1
additional info: AIRGUN SYSTEM - Source: An array of 5 x 40 cu.in. Bolt 600B airguns with waveshape kits and time break solenoids. Routinely, up to four guns were fired simultaneously, keeping the fifth gun as a ready spare. The number of guns used was varied with water depth, with a minimum of two being used in the shallower areas. The firing rate varied from 6 – 8 seconds depending on water depth. Gun synchronisation was achieved by monitoring the time break solenoids and manually adjusting as required. This introduced a short time delay into the system of approximately 50 msec and thus the sea-bed return time was not an absolute measurement of depth. Hydrophone: Two channel Geomechanique summed to give a single channel 30m active length. The summing amplifier used was a newly developed BGS unit, which also incorporated low pass and anti-alias filters. Recording: CODA DA200 four channel digital recording and processing system. The data was recorded on Exabyte tape in CODA format with a sampling interval of 0.2 msec, record length of 4 seconds and bandpass filter of 20-800Hz. The start of recording was delayed in deep water to permit a minimum of 2 seconds (TWTT) of data below the sea bed. The CODA system also received a navigation data string from the navigation processor, and logged position on each shot. On-line processing: CODA system.Processes applied were time varied gain (TVG), time varied filtering (TVF) and trace mixing. Both TVG and TVF were applied from the sea bed, which was tracked automatically. SPARKER SYSTEM - Source: EG&G, nine candle, multi-tip array with 135 tips. High Voltage Power Supply: 2 x Applied Acoustic Engineering CSP3000 capacitor charging units, switchable output up to a maximum of 2.2 KJ. Hydrophone: Teledyne, 10 m, 7 channels with all summed to give a single output. Recording: The same CODA DA200 four channel digital recording and processing system as for the airgun. The data were recorded with a sampling interval of 0.1 msec, record length of 1.5 se…
confidentiality: unclassified (open file)
cruise alias: D273
nav equip type: Differential GPS, GPS
accessuse restric: unrestricted use, copyright acknowledgement
restitle: Geophysical Survey 2003/1: Regional Study: Hatton-Rockall (11/Aug/2003 to 28/Aug/2003)
geophys equip type: Airgun/Sleeve Gun, Echo Sounder, Gravimeter, Magnetometer, Pinger, 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: RRS Discovery
terms of use url: http://nationalarchives.gov.uk/doc/open-government-licence/version/3/
client: British Geological Survey
start date: 2003-08-11T00:00:00
contractor: British Geological Survey
start date est: Real
cruise data url: http://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item175096
cruise area: CP2 Regional Sea Boundaries: Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel, Scottish Continental Shelf, Offshore 1:250k: Bill Bailey's Bank, Darwin, Geikie, Kennedy, Lousy Bank, Rosemary Bank, Offshore 1:500k: North Hatton, North Rockall Basin, SeaVoX Sub-Ocean: NORTHEAST ATLANTIC OCEAN (40W)
end date: 2003-08-28T00:00:00
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