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Geomorphology and Remote Physical Properties of Late Quaternary Slide Structures using Decimetre-Resolution 3D Seismic Volumes: Insights for Deep Water Geohazard Assessment

By
M.E. Vardy
M.E. Vardy
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J.K. Dix
J.K. Dix
School of Ocean and Earth Science National Oceanography Centre, Southampton European Way Southampton SO14 3ZH UK
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T.J. Henstock
T.J. Henstock
School of Ocean and Earth Science National Oceanography Centre, Southampton European Way Southampton SO14 3ZH UK
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J.M. Bull
J.M. Bull
School of Ocean and Earth Science National Oceanography Centre, Southampton European Way Southampton SO14 3ZH UK
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J.W. Davis
J.W. Davis
School of Ocean and Earth Science National Oceanography Centre, Southampton European Way Southampton SO14 3ZH UK
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L.J.W. Pinson
L.J.W. Pinson
School of Ocean and Earth Science National Oceanography Centre, Southampton European Way Southampton SO14 3ZH UK
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J.-S. L’Heureux
J.-S. L’Heureux
Geological Survey of Norway Leiv Eirikssons vei 39 7040 Trondheim Norway
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O. Longva
O. Longva
Geological Survey of Norway Leiv Eirikssons vei 39 7040 Trondheim Norway
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L. Hansen
L. Hansen
Geological Survey of Norway Leiv Eirikssons vei 39 7040 Trondheim Norway
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S. Chand
S. Chand
Geological Survey of Norway Leiv Eirikssons vei 39 7040 Trondheim Norway
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Published:
December 01, 2010

Abstract

Traditional exploration methods, involving a combination of two-dimensional seismic profiles with cores and/or swath bathymetry/side-scan sonar, do not adequately sample all three spatial dimensions for true morphological mapping of submarine mass movement deposits. It is only with the acquisition of three-dimensional (3D) seismic volumes that the complex 3D nature of these features can be correctly imaged. Over the last 5-10 years, the interpretation of industry-scale 3D seismic volumes from numerous continental shelf locations has allowed effective mapping of the deposit morphology. Features such as head scarps, side walls, extensional/compressional ridges, striations on the basal surface, translated blocks, and preservation/deformation of internal reflectors have been shown to constrain the direction and method of material transport. Here we demonstrate the application of these techniques to the shallow-water environment using decimeter-resolution 3D seismic volumes, with case studies from Trondheimsfjorden (Norway) and Lake Windermere (UK Lake District). Through the mapping of top/base reflector morphologies, internal structure, translated blocks, and head scarps/side walls we demonstrate the same techniques can be used to differentiate flow mechanics (coherent slide blocks, slumped material, debris flows, and a mass flow) and quantify direction of motion at this radically different scale.

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Contents

GCSSEPM

Seismic Imaging of Depositional and Geomorphic Systems

Lesli J. Wood
Lesli J. Wood
Houston, Texas
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Toni T. Simo
Toni T. Simo
Houston, Texas
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Norman C. Rosen
Norman C. Rosen
Houston, Texas
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SEPM Society for Sedimentary Geology
Volume
30
ISBN electronic:
978-0-9836096-0-5
Publication date:
December 01, 2010

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