Alternate title

CE0705

Date (Publication)

2007-06-18

Citation identifier

British Geological Survey / BGS_CMD_REF323

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Custodian
Joint Nature Conservation Committee		offshoredata@bgs.ac.uk	Originator

Maintenance and update frequency

Not planned

Keywords

• NDGO0001

GEMET - INSPIRE themes, version 1.0

• Geology

SeaVoX Vertical Co-ordinate Coverages (L131)

• soil and sediment
• crust

SeaDataNet Parameter Discovery Vocabulary (P021)

• Two-dimensional seismic reflection

Access constraints

Other restrictions

Access constraints

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

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 Creative Commons Licence subject to the following acknowledgement accompanying the reproduced Department for Environment, Food and Rural Affairs, Joint Nature Conservation Committee, Marine Institute, British Geological Survey, University of Plymouth materials "Joint copyright ©2007 Defra, JNCC, Marine Institute, BGS, University of Plymouth"

Spatial representation type

Grid

Distance

5  urn:ogc:def:uom:EPSG::9001

Language

English

Topic category

• Geoscientific information

Geographic identifier

Little Sole Bank

BGS Gazetteer 2024-12-06 revision

Geographic identifier

Western Channel & Celtic Sea

Charting Progress 2: Regional Sea Boundaries 2009-06-18 creation

Geographic identifier

CELTIC SEA

The SeaVoX Salt and Fresh Water Body Gazetteer: Sub-Ocean Category 1954-01-01 creation

Geographic identifier

NORTHEAST ATLANTIC OCEAN (40W)

The SeaVoX Salt and Fresh Water Body Gazetteer: Sub-Ocean Category 1954-01-01 creation

Begin date

2007-06-04

End date

2007-06-18

Reference system identifier

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

www.epsg.org 2005 revision

Distribution format

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
HTTP	http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2007/6_MESH	BGS Offshore Geoindex

Hierarchy level

Dataset

Statement

Geophysical equipment types used included: Deep Tow Boomer and Sparker. The survey was undertaken by Joint Nature Conservation Committee. Navigation: Fugro Starfix-HP (High Precision) GPS positioning system. All data acquisition systems took their time stamp from this navigation signal. The Starfix HP performed well during operations with only one significant occurrence of loss of navigation from 03:27 to 04:54 on the 9th June 2007 during seismic data acquisition on line 4. Some problems were experienced with the USBL system, particularly towards the latter half of the cruise. Multi-tip Sparker System: Source: EG&G, nine candle, multi-tip array with 135 tips. At times during the course of this cruise, it was sufficient to only operate with 90 tips. Power is supplied from an Applied Acoustic Engineering CSP-D HV Bangbox, running at 1000 Joules per shot on lines 1-7, 1250 Joules per shot on lines 8-11, 750-1500 Joules per pulse on line 12 and 1500 Joules per shot on lines 13-16. The CSP-D utilised the ship's main 240V 'domestic' power on a 16A circuit breaker. The Sparker was fired once every 6 seconds, interleaved with the Deep-Tow Boomer firing. Hydrophone: SIG 7 channel, 10m hydrophone streamer and SIG preamplifier with all channels summed to give a single channel output. The summed output was fed into the British Geological Survey (BGS) own designed amplifier that incorporates low pass and anti-alias filters and manually adjustable analogue gain to compensate for acoustic losses with water depth. For the Sparker system the bandpass filter is between 100 and 1730 Hz. Recording: The recording system is a CODA DA200 with twin displays and set up to digitally record two seismic sources simultaneously, in this case the Sparker and Deep Tow Boomer. The output data was stored in CODA and SEGY format. The Sparker signal was sampled at 5000Hz. Deep Tow Boomer System: Source: The Deep Tow Boomer system is a towed negatively buoyant fish comprising a 'boomer plate' transducer, high voltage storage and discharge system, a short hydrophone streamer and various sensors and controls. The high voltage power is supplied by a 240VAC to 6000VDC transformer on the vessel. The Deep Tow Boomer was generally fired 3-4 times in every 6 seconds, depending on water depth and the height of the tow fish from the seabed, interleaved with the Sparker firing. Hydrophone: A 2m, 6 element deep water BGS streamer was used during this cruise. The amplifier incorporates low pass and anti-alias filters and manually adjustable analogue gain to compensate for acoustic losses with water depth. For the Deep Tow Boomer the bandpass filter is between 450 and 4500 Hz. Recording: CODA DA200 system. The Deep Tow Boomer signal was sampled at 10,000Hz. Multibeam: Simrad EM1002 system is designed for high-resolution sea bed mapping in water depths of less than 1000 m. The hull-mounted system operates at a frequency of 93-95 kHz. A fixed swath coverage of 660m was utilised throughout, to maintain a beam spacing of at least 5% of water depth, providing the acceptable data density and data quality. Processing was carried out onboard using CARIS HIPS and SIPS and a variety of output formats were produced including the processed xyz files, ArcGIS raster files, Geotiffs and Fledermaus files. Precision Echo Sounder (EA600): The Simrad EA600 single beam system is a multi frequency hydrographic echo sounder. The three main frequencies are 12kHz, 38kHz and 200kHz with the shared transducer at 120kHz. Seatronics DTS 6000 Drop Frame Camera: The Seatronics drop frame system was deployed from the starboard side of the vessel. The system comprised a 5 mega pixel Kongsberg and Imenco digital stills camera, and an integrated DTS 6000 digital video telemetry system. Sensors monitored depth, altitude and temperature. A USBL beacon provided positional information for 14 camera tows, however, for the latter 30 tows the USBL was not working and vessel position was used. .

Metadata

File identifier

abc9f747-5339-0f38-e044-0003ba9b0d98 XML

Metadata language

English

Hierarchy level

Dataset

Date stamp

2024-12-06

Metadata standard name

MEDIN Discovery Metadata Standard

Metadata standard version

Version 2.3.5

Metadata author

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey (BGS)		enquiries@bgs.ac.uk	Point of contact