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3D chirp sub-bottom imaging system: design and first 3D volume

Bull, Jonathan M., Gutowski, Martin, Dix, Justin K., Henstock, Timothy J., Hogarth, Peter, Leighton, Timothy G. and White, Paul R., (2005) 3D chirp sub-bottom imaging system: design and first 3D volume Papadakis, J.S. and Bjorno, L. (eds.) At International Conference on Underwater Acoustic Measurements: Technologies & Results. 28 Jun - 01 Jul 2005. , pp. 777-782.

Record type: Conference or Workshop Item (Paper)

Abstract

Chirp sub-bottom profilers are marine acoustic devices that use a known and repeatable source signature (1 – 24 kHz) to produce decimetre vertical resolution crosssections of the sub-seabed. Here the design and development of the first true 3D Chirp system is described. When developing the design, critical factors that had to be considered included spatial aliasing, and precise positioning of sources and receivers. The design incorporates 4 source transducers (1.5 – 13 kHz) that can be arranged into different configurations, including Maltese Cross, a square and two separated pairs. The receive array comprises 240 hydrophones in 60 groups whose group-centres are separated by 25 cm in both horizontal directions, with each hydrophone group containing four individual elements and a preamplifier.
It was concluded that the only way to determine with sufficient accuracy the source-receiver geometry, was to fix the sources and receivers within a rigid array. Positional information for the array is given by a Real Time Kinematic GPS and attitude system incorporating four antennas to give position, heading, pitch and roll. The complete system is described and initial navigational and seismic data results are presented for a 3D seismic volume over folded geological events within the West Solent (UK). These data demonstrate that the approach of using a fixed source-receiver geometry combined with RTK navigation will provide complete 3D imaging of the sub-surface.

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More information

Published date: 2005
Venue - Dates: International Conference on Underwater Acoustic Measurements: Technologies & Results, 2005-06-28 - 2005-07-01
Keywords: 3d seismic, chirp, 3d acoustics, high resolution reflection seismology

Identifiers

Local EPrints ID: 28303
URI: http://eprints.soton.ac.uk/id/eprint/28303
PURE UUID: 234b5294-7e6b-4fd9-ae84-c957d5d6d279
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514
ORCID for Timothy G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750
ORCID for Paul R. White: ORCID iD orcid.org/0000-0002-4787-8713

Catalogue record

Date deposited: 03 May 2006
Last modified: 17 Jul 2017 16:02

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