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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.
British Geological Survey (BGS)
Other details | ||
Internal code | Internally assigned metadata identifier | 27356 |
Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Rockall Consortium (RCK) Geophysical Survey 1992/1_RCK: Northern Rockall Trough and surrounding shallow water areas (10/05/1992 to 04/07/1992) |
File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | abc9f747-53a0-0f38-e044-0003ba9b0d98 |
Resource Identifier | This is the code assigned by the data owner. | BGS_CMD_REF256 |
Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 1992-05-03 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 1992-07-10 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 5 |
Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | urn:ogc:def:uom:EPSG::9001 |
Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | 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. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | 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. . |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | NDGO0001 |
Keyword title | NERC OAI Harvesting | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Geology |
Keyword title | Geology | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | soil and sediment |
Keyword title | soil and sediment | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | crust |
Keyword title | crust | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Gravity |
Keyword title | Gravity | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Lithology |
Keyword title | Lithology | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bathymetry and Elevation |
Keyword title | Bathymetry and Elevation | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Magnetics |
Keyword title | Magnetics | |
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Two-dimensional seismic reflection |
Keyword title | Two-dimensional seismic reflection | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 60.5099 |
East | The eastern-most limit of the data resource in decimal degrees | -9.0382 |
South | The southern-most limit of the data resource in decimal degrees | 56.5448 |
West | The western-most limit of the data resource in decimal degrees | -19.8157 |
Regional sea | McCallien | |
Hebrides Terrace | ||
Peach | ||
Rockall Island | ||
Anton Dohrn | ||
St Kilda | ||
George Bligh Bank | ||
Harker | ||
Geikie | ||
Kennedy | ||
Rosemary Bank | ||
Darwin | ||
North Rockall Basin | ||
North Hatton | ||
Central Rockall Basin | ||
Central Hatton | ||
Scottish Continental Shelf | ||
Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel | ||
NORTHEAST ATLANTIC OCEAN (40W) | ||
Responsible organisations | ||
Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
Organisation name | British Geological Survey (BGS) | |
Phone | +44 (0)131 667 1000 | |
Fax | +44 (0)131 668 4140 | |
Delivery point | The Lyell Centre, Research Avenue South | |
Postal code | EH14 4AP | |
City | Edinburgh | |
Country | UK | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | British Geological Survey (BGS) | |
Phone | +44 (0)131 667 1000 | |
Fax | +44 (0)131 668 4140 | |
Delivery point | The Lyell Centre, Research Avenue South | |
Postal code | EH14 4AP | |
City | Edinburgh | |
Country | UK | |
Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
Organisation name | British Geological Survey (BGS) | |
Phone | +44 (0)131 667 1000 | |
Fax | +44 (0)131 668 4140 | |
Delivery point | The Lyell Centre, Research Avenue South | |
Postal code | EH14 4AP | |
City | Edinburgh | |
Country | UK | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | Rockall Consortium | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=1992/1_RCK |
Locator name | Name of the web resource | BGS Offshore Geoindex |
Locator function | Code that describes the function of the resource. ISO function code chosen from ISO 19115-1 Codelist | search |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
21 Conditions for access and use – Use limitation | Any restrictions imposed on accessing the resource. | 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]" |
Version info | ||
Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 1992-07-10 |
Metadata date | The date when the content of this metadata record was last updated. | 2024-03-26 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata Standard |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.5 |
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