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.

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]"

Geophysical equipment types used included: Deep Tow Boomer, Echo Sounder and Pinger. The survey was undertaken by British Geological Survey. Deep Tow Boomer: Source: BGS developed deep towed fish based on a Huntec boomer plate. Operating power 0.5kJ to a tow depth of 800m. Motion compensation applied. Hydrophone: Short 1m multi-element array towed behind the fish. Pinger: Edo Western 35/7.0 kHz tranducer in towed fish. Tow depth Sm. Power output 10kW using SlSA-248 transceiver. Transducer operated in 7.0 kHz mode. Bathymetry: Atlas Deso 20 with narrow beam deep water 33 kHz transducer rated to 2200m. Data also output digitally to Qubit Trac IV logging system. Positioning System: VERIPOS differential GPS system based on 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 position to the Qubit Trac IV logging system. Correction data were received from shore stations at Wick, Brest and Barra. Two completely independent VERIPOS receivers were operated simultaneously giving 100% back up. Data Logging: Qubit Trac IV navigation processor/logger. Using position information input from the VERIPOS system the logger produced navigation information, helmsman display, track plotting to AO drum plotter and fix outputs at 5 minute intervals to all survey recorders, whilst logging navigation and bathymetry survey data at half minute intervals to magnetic tape. Seismic Firing Control: BGS seismic control unit to synchronise firing of pinger and deep tow boomer to allow concurrent operation. Firing interval of boomer was 2~ seconds with interleaved firing of pinger to allow 1 second shot interval. An inhibit pulse was provided to the echo sounder at pinger shot instant. For more information see the report, https://nora.nerc.ac.uk/id/eprint/529922/.

MEDIN Discovery Metadata Standard

Version 2.3.5