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Construction and subduction of the Louisville Ridge, SW Pacific—insights from wide-angle seismic data modelling

Robinson, A.H.; Peirce, C.; Funnell, M.J.

Construction and subduction of the Louisville Ridge, SW Pacific—insights from wide-angle seismic data modelling Thumbnail


Authors

A.H. Robinson

M.J. Funnell



Abstract

The Louisville Ridge is a ca. 4000 km-long chain of seamounts in the SW Pacific that is currently being subducted at the Tonga-Kermadec trench. The Pacific Plate, on which the chain sits, is subducting obliquely beneath the Indo-Australian Plate. Combined with the oblique strike of the chain relative to the margin, this results in the southward migration of the ridge-trench intersection and leads to significant along-trench variation in forearc morphology as a result of tectonic erosion processes. To understand how the subduction of such large-scale plate topography controls forearc deformation, knowledge of the structure of the seamounts themselves and the crust upon which they lie, and how these seamounts are deformed prior to and on entering the trench is required. The TOTAL (Tonga Thrust earthquake Asperity at Louisville Ridge) project aimed to address these questions by undertaking a multidisciplinary geophysical study of the ridge-trench intersection and surrounding region, as part of which multichannel and wide-angle seismic, gravity and swath bathymetry data were acquired along a ∼750 km-long profile extending along the Louisville Ridge and into the adjacent Tonga forearc.

Citation

Robinson, A., Peirce, C., & Funnell, M. (2018). Construction and subduction of the Louisville Ridge, SW Pacific—insights from wide-angle seismic data modelling. Geophysical Journal International, 215(3), 2222-2245. https://doi.org/10.1093/gji/ggy397

Journal Article Type Article
Acceptance Date Sep 24, 2018
Online Publication Date Oct 1, 2018
Publication Date Dec 1, 2018
Deposit Date May 31, 2017
Publicly Available Date Mar 28, 2024
Journal Geophysical Journal International
Print ISSN 0956-540X
Electronic ISSN 1365-246X
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 215
Issue 3
Pages 2222-2245
DOI https://doi.org/10.1093/gji/ggy397

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Accepted Journal Article (34.1 Mb)
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Copyright Statement
This article has been accepted for publication in Geophysical Journal International ©: 2018 The Author(s) 2018. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved.





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