https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/315
type: Place
id: 315.0
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client: British Geological Survey
start date: 2006-05-20T00:00:00
terms of use url: http://nationalarchives.gov.uk/doc/open-government-licence/version/3/
contractor: British Geological Survey
start date est: Real
cruise area: CP2 Regional Sea Boundaries: Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel, Minches & Western Scotland, Scottish Continental Shelf, Offshore 1:250k: Bill Bailey's Bank, Darwin, Faroe Bank, Lousy Bank, Malin, Munken, Peach, Rockall Island, Rosemary Bank, St Kilda, Tiree, Wyville Thomson, Offshore 1:500k: Central Hatton, Central Rockall Basin, North Hatton, North Rockall Basin, SeaVoX Sub-Ocean: INNER SEAS OFF THE WEST COAST OF SCOTLAND, NORTHEAST ATLANTIC OCEAN (40W)
end date: 2006-06-09T00:00:00
cruise data url: http://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item175097
abstract: This British Geological Survey (BGS) marine geophysical and multibeam survey took place in May/June 2006 in the Rockall-Hatton-Faeroes region west of Scotland on board the RRS Charles Darwin. The purpose was to define the size and shape of the basalt window, identify and/or contrain compressional folds/faults/thrusts and to investigate the siesmo-stratigraphy of the Faeroe-Bank Channel to identify potential borehole locations. Additional seismic reflection data were run south of St Kilda and Stanton Bank. Subsurface seismic data were collected using an airgun, sparker and pinger. Seafloor bathymetry data were collected using a Simrad EM12 multibeam system and magnetic and gravity data were also collected. All data were recorded digitally. These data are archived by BGS. Technical details of the survey are contained in BGS Internal Report IR/06/076 (http://nora.nerc.ac.uk/id/eprint/7301/) and Report on a survey over Stanton Bank 4 for MESH, June 2006 (http://nora.nerc.ac.uk/id/eprint/7422). A preliminary overview and interpretations of data gathered are contained in Geological Summary Report CR/06/190 (http://nora.nerc.ac.uk/id/eprint/507380/). GeoIndex Offshore - https://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2006/2&.
end date est: Real
cruise: 2006/2
additional info: NAVIGATION: vessels Trimble DGPS system, WGS84. AIRGUN: Source: An array of 5 x 40 cu inch Bolt 600B airguns with waveshape kits and time break solenoids. Hydrophone (receiver): A 4 channel SIG hydrophone summed to give a single channel 32m active length. Recording: The BGS CODA DA200, software version 3.9.11.5L(3360) 2005 four-channel digital recording and processing system was utilised to record the raw data. The data were recorded to Flipdisks in CODA format with a sampling frequency of 3kHz, record length of 4 seconds and bandpass filter of 25-800 Hz. The start of recording was delayed in deep water to permit a minimum of 2 seconds of data below the sea-bed. The CODA system also received a navigation data string from the vessels Trimble DGPS system, and logged position, time and date for each shot. On line processing: the CODA system was also used to process the data on-line and produce a real time hard copy output on an Ultra 120 thermal printer. Processes applied were time varied gain (TVG), time varied filtering (TVF) and trace mixing and, in extremely large amplitude sea swell situations, a swell filter. Both TVG and TVF were applied from the sea-bed, which was tracked automatically. A 1.5 sec record length was used for the on-line hard copy, with a delay adjusted to give an optimum record for the water depth. SPARKER: Source: EG&G, nine candle, multi-tip sparkarray with 135 tips. High Voltage Power Supply: An Applied Acoustic Engineering CSP2200 capacitor charging unit. This is a single unit, powered from the ship’s 240VAC supply incorporating switchable output energy up to a maximum of 2200 J. Apart from lines 2-5 (1800J) the whole survey was conducted at an output of 2200 J. Hydrophone (receiver): A seven channel Teledyne 10m hydrophone, summing on the most part, all channels to give a single output. Recording: same system as the airgun, the data were recorded with a sampling frequency of 5kHz, record length of 1.9 seconds and a bandpass filter of 100-173…
confidentiality: unclassified (open file)
cruise alias: CD180, Stanton Bank
nav equip type: Differential GPS
accessuse restric: unrestricted use, copyright acknowledgement
restitle: Geophysical and Multibeam Survey 2006/2: North West Scotland, CD180 (20/May/2006 to 09/Jun/2006)
geophys equip type: Airgun/Sleeve Gun, Echo Sounder, Gravimeter, Magnetometer, Multibeam, 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 Charles Darwin
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