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Controls on spatial and temporal evolution of prism faulting and relationships to plate boundary slip offshore north-central Sumatra

Controls on spatial and temporal evolution of prism faulting and relationships to plate boundary slip offshore north-central Sumatra
Controls on spatial and temporal evolution of prism faulting and relationships to plate boundary slip offshore north-central Sumatra
Across- and along-strike variations in the morphology and structure of the north-central Sumatran forearc (~1.5°S to 1°N) are broadly coincident with subducting plate topography and an earthquake segment boundary zone below the Batu Islands. We present a detailed interpretation of multichannel streamer seismic reflection data collected offshore north-central Sumatra, to better characterize the morphological and structural variations, provide insight into fault development, and relate structure to plate boundary rupture and seismicity patterns. We interpret two relatively continuous, major fault structures that divide the prism into three strike-parallel belts that can be characterized by the relative fault slip rates along major and minor fault structures. The midslope break fault(s) and upper slope-bounding fault(s) are major, potentially out-of-sequence thrusts accommodating a significant component of the compressional strain. We propose that the upper slope-bounding fault represents the more mature end-member of an evolving fault system. Landward vergent structures are associated with a relatively thin sedimentary section near the deformation front in the center of our study area and suggest a potentially weak shallow plate boundary associated with the subducting Wharton Fossil Ridge.
accretionary prism, seismic reflection, out-of-sequence thrusting, landward vergence, earthquake segmentation, Sunda subduction zone
5594-5612
Cook, Becky J.
c114ede4-47e6-450b-a754-71097473245e
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Cook, Becky J.
c114ede4-47e6-450b-a754-71097473245e
Henstock, Timothy J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Bull, Jonathan M.
974037fd-544b-458f-98cc-ce8eca89e3c8

Cook, Becky J., Henstock, Timothy J., McNeill, Lisa C. and Bull, Jonathan M. (2014) Controls on spatial and temporal evolution of prism faulting and relationships to plate boundary slip offshore north-central Sumatra. Journal of Geophysical Research: Solid Earth, 119 (7), 5594-5612. (doi:10.1002/2013JB010834).

Record type: Article

Abstract

Across- and along-strike variations in the morphology and structure of the north-central Sumatran forearc (~1.5°S to 1°N) are broadly coincident with subducting plate topography and an earthquake segment boundary zone below the Batu Islands. We present a detailed interpretation of multichannel streamer seismic reflection data collected offshore north-central Sumatra, to better characterize the morphological and structural variations, provide insight into fault development, and relate structure to plate boundary rupture and seismicity patterns. We interpret two relatively continuous, major fault structures that divide the prism into three strike-parallel belts that can be characterized by the relative fault slip rates along major and minor fault structures. The midslope break fault(s) and upper slope-bounding fault(s) are major, potentially out-of-sequence thrusts accommodating a significant component of the compressional strain. We propose that the upper slope-bounding fault represents the more mature end-member of an evolving fault system. Landward vergent structures are associated with a relatively thin sedimentary section near the deformation front in the center of our study area and suggest a potentially weak shallow plate boundary associated with the subducting Wharton Fossil Ridge.

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e-pub ahead of print date: 10 July 2014
Published date: July 2014
Keywords: accretionary prism, seismic reflection, out-of-sequence thrusting, landward vergence, earthquake segmentation, Sunda subduction zone
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 368031
URI: http://eprints.soton.ac.uk/id/eprint/368031
PURE UUID: e138844d-c66e-4307-9965-113ac820c8fa
ORCID for Timothy J. Henstock: ORCID iD orcid.org/0000-0002-2132-2514
ORCID for Lisa C. McNeill: ORCID iD orcid.org/0000-0002-8689-5882
ORCID for Jonathan M. Bull: ORCID iD orcid.org/0000-0003-3373-5807

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Date deposited: 18 Aug 2014 08:44
Last modified: 15 Mar 2024 03:09

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Contributors

Author: Becky J. Cook
Author: Lisa C. McNeill ORCID iD

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