British Geological Survey (BGS) Geophysical Survey 2003/1: Regional Study: Hatton-Rockall (11/Aug/2003 to 28/Aug/2003)
D273
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&.
dataset
http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2003/1
protocol: HTTP
name: BGS Offshore Geoindex
description: 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.
function: search
BGS_CMD_REF300
British Geological Survey
eng
OGP
urn:ogc:def:crs:EPSG::4326
geoscientificInformation
publication
2008-06-01
revision
2010-05-18
revision
2011-07-27
-16.9501
-8.6607
60.9323
58.4333
revision
2024-04-18
Geikie
revision
2024-04-18
Kennedy
revision
2024-04-18
Rosemary Bank
revision
2024-04-18
Darwin
revision
2024-04-18
Lousy Bank
revision
2024-04-18
Bill Bailey's Bank
revision
2024-04-18
North Rockall Basin
revision
2024-04-18
North Hatton
creation
2009-06-18
Scottish Continental Shelf
creation
2009-06-18
Atlantic North-West Approaches, Rockall Trough and Faeroe/Shetland Channel
creation
1954-01-01
NORTHEAST ATLANTIC OCEAN (40W)
2003-08-11
2003-08-28
publication
2003-08-28
notPlanned
Geophysical equipment types used included: Airgun/Sleeve Gun, Echo Sounder, Gravimeter, Magnetometer, Pinger and Sparker. The survey was undertaken by British Geological Survey. 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 seconds and a bandpass filter of 103-1730 Hz. SUB- BOTTOM PROFILER - IOS 3.5kHz system: a high resolution, deep water (up to 6000m) swept or ‘chirp’ frequency profiling system transceiver: Raytheon PTR 105B producing 6 kWatts of acoustic power. Recorder: Waverley 3710 Linescan recorder and was selected for a 480 msec sweep. The towfish contained four TR109F Massa transducers wired in a parallel series combination. GRAVITYMETER - LaCoste and Romberg AIR-SEA system. MAGNETOMETER - Direct Reading Barringer M123 marine proton precession magnetometer with 1 gamma sensitivity. VECTOR MAGNETOMETER: A three-component vector magnetometer, supplied by the BGS Geomagnetism Programme. ECHO SOUNDER - Simrad EA500 hydrographic echo sounder with a 9 element tow fish operating at 10 kHz. NAVIGATION - Primary: Trimble GPS 4000DL. Secondary: Ashtech GG-24 (combined GPS + GLONASS). The differential corrections for both of these files are fed from a Sea Star (3000L DGPS set to Eik EMS). it must be assumed that prior to 0000 Day 236, positioning was GPS without differential corrections. The ship’s Ashtec ADU-2 (ships attitude) multihead GPS was logged for the duration of the cruise All position data are referred to the WGS 84 datum. For more detailed information on the acquisition equipment and data collection techniques, operational standards, data processing methods and quality control procedures used on this survey see the Report of Survey/Cruise Report and associated documentation where available. The information available may vary depending on the age of the survey. Data are checked and loaded to the BGS Coastal and Marine data management system following BGS marine data management procedures.
publication
2011
false
See the referenced specification
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]"
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.
British Geological Survey (BGS)
The Lyell Centre, Research Avenue South
Edinburgh
EH14 4AP
UK
+44 (0)131 667 1000
+44 (0)131 668 4140
custodian
British Geological Survey (BGS)
The Lyell Centre, Research Avenue South
Edinburgh
EH14 4AP
UK
+44 (0)131 667 1000
+44 (0)131 668 4140
originator
British Geological Survey (BGS)
The Lyell Centre, Research Avenue South
Edinburgh
EH14 4AP
UK
+44 (0)131 667 1000
+44 (0)131 668 4140
pointOfContact
2024-04-18