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

3D chirp sub-bottom imaging system: design and first 3D volume
3D chirp sub-bottom imaging system: design and first 3D volume
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.
3d seismic, chirp, 3d acoustics, high resolution reflection seismology
777-782
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Gutowski, Martin
cd31d0d7-2bcc-4c54-8b33-610ce765d7e5
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Hogarth, Peter
655cda79-d358-4f19-9ac1-080d358db76e
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Papadakis, J.S.
712e3be6-ba7c-4551-9100-04297a47992b
Bjorno, L.
18b63f9f-1092-40b2-a306-36664cccfc45
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Gutowski, Martin
cd31d0d7-2bcc-4c54-8b33-610ce765d7e5
Dix, Justin K.
efbb0b6e-7dfd-47e1-ae96-92412bd45628
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Hogarth, Peter
655cda79-d358-4f19-9ac1-080d358db76e
Leighton, Timothy G.
3e5262ce-1d7d-42eb-b013-fcc5c286bbae
White, Paul R.
2dd2477b-5aa9-42e2-9d19-0806d994eaba
Papadakis, J.S.
712e3be6-ba7c-4551-9100-04297a47992b
Bjorno, L.
18b63f9f-1092-40b2-a306-36664cccfc45

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.) 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: https://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

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Date deposited: 03 May 2006
Last modified: 06 Jun 2018 13:12

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Contributors

Author: Martin Gutowski
Author: Justin K. Dix
Author: Peter Hogarth
Author: Paul R. White ORCID iD
Editor: J.S. Papadakis
Editor: L. Bjorno

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