Date (Publication)

1992-07-10

Identifier

British Geological Survey / BGS_CMD_REF256

Maintenance and update frequency

notPlanned Not planned

Keywords

• NDGO0001

GEMET - INSPIRE themes

• Geology

SeaVoX Vertical Co-ordinate Coverages (L131)

• soil and sediment
• crust

SeaDataNet Parameter Discovery Vocabulary (P021)

• Gravity
• Lithology
• Bathymetry and Elevation
• Magnetics
• Two-dimensional seismic reflection

Access constraints

otherRestrictions Other restrictions

Access constraints

otherRestrictions No restrictions, a copyright acknowledgement is required and permission from any third party for the release of the data has been obtained. Inclusion of any third party data will determine the copyright acknowledgement that needs to be made.

Use constraints

otherRestrictions Other restrictions

Other constraints

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Use limitation

unrestricted use, copyright acknowledgement - 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]"

Spatial representation type

grid Grid

Distance

5  urn:ogc:def:uom:EPSG::9001

Metadata language

EnglishEnglish

Topic category

• Geoscientific information

Geographic identifier

McCallien

Date (Revision)

2023-11-27

Geographic identifier

Hebrides Terrace

Date (Revision)

2023-11-27

Geographic identifier

Peach

Date (Revision)

2023-11-27

Geographic identifier

Rockall Island

Date (Revision)

2023-11-27

Geographic identifier

Anton Dohrn

Date (Revision)

2023-11-27

Geographic identifier

St Kilda

Date (Revision)

2023-11-27

Geographic identifier

George Bligh Bank

Date (Revision)

2023-11-27

Geographic identifier

Harker

Date (Revision)

2023-11-27

Geographic identifier

Geikie

Date (Revision)

2023-11-27

Geographic identifier

Kennedy

Date (Revision)

2023-11-27

Geographic identifier

Rosemary Bank

Date (Revision)

2023-11-27

Geographic identifier

Darwin

Date (Revision)

2023-11-27

Geographic identifier

North Rockall Basin

Date (Revision)

2023-11-27

Geographic identifier

North Hatton

Date (Revision)

2023-11-27

Geographic identifier

Central Rockall Basin

Date (Revision)

2023-11-27

Geographic identifier

Central Hatton

Date (Revision)

2023-11-27

Geographic identifier

Scottish Continental Shelf

Date (Creation)

2009-06-18

Geographic identifier

Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel

Date (Creation)

2009-06-18

Geographic identifier

NORTHEAST ATLANTIC OCEAN (40W)

Date (Creation)

1954-01-01

Begin date

1992-05-03

End date

1992-07-10

Reference system identifier

OGP / urn:ogc:def:crs:EPSG::4326

Date (Revision)

2005

Distribution format

OnLine resource

BGS Offshore Geoindex ( HTTP )

GeoIndex allows users to search for information about BGS data collections covering the UK and other areas world wide. Access is free, the interface is easy to use, and it has been developed to enable users to check coverage of different types of data and find out some background information about the data. More detailed information can be obtained by further enquiry through the website.

Hierarchy level

dataset Dataset

Statement

Geophysical equipment types used included: Airgun/Sleeve Gun, Deep Tow Boomer, Echo Sounder, Gravimeter, Magnetometer and Sparker. Sample equipment types used included: Grab. The survey was undertaken by Rockall Consortium. 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 was based on a Sercel NR 103 DGPS receiver. This fully integrated unit received both GPS data and differential correction data, carried out the corrections processing and output a differentially corrected positon to the Qubit Trac IV logging system. Correction data was received from shore stations at Wick, Brest (both part of the established VERIPOS network) and Barra. The latter station was set up specifically for this survey but, because of radio licencing difficulties, did not come online until the early part of Leg 2. Two completely independent VERIPOS receivers were operated simultaneously giving 100% back-up. Data Logging System: Qubit Trac IV navigation processor/logger. Using position information input from the VERIPOS system the Qubit systempr oduced navigation information, helmsman display, track plotting and fix outputs to all survey recorders, whilst logging navigation and geophysical survey data at one minute intervals to magtape. Preliminary processing of the logged data was carried out using the BGS PC based processing package for data quality control. For more information see the Cruise Report and associated documentation where available. .

File identifier

abc9f747-53a0-0f38-e044-0003ba9b0d98 XML

Metadata language

EnglishEnglish

Hierarchy level

dataset Dataset

Date stamp

2023-11-27

Metadata standard name

MEDIN Discovery Metadata Standard

Metadata standard version

Version 2.3.5