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The relationship between normal drag, relay ramp aspect ratio and fault zone structure

By
C. Childs
C. Childs
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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T. Manzocchi
T. Manzocchi
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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A. Nicol
A. Nicol
GNS Science, Lower Hutt, New ZealandPresent address: University of Canterbury, Christchurch, New Zealand
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J.J. Walsh
J.J. Walsh
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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A.M. Soden
A.M. Soden
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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J.C. Conneally
J.C. Conneally
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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E. Delogkos
E. Delogkos
Fault Analysis Group, School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
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Published:
January 01, 2017

Abstract:

The boundaries between pairs of adjacent fault segments within normal fault arrays define a spectrum of structures, from relay ramps where the length of overlap between the fault segments is much larger than the separation, through low aspect ratio (overlap/separation) relay ramps and ultimately to underlapping fault segments. Where fault segments underlap, transfer of displacement between them is accommodated by a connecting monocline. When displacement increases and a through-going fault forms, relay ramps are preserved as fault-bounded zones of elevated bed dip and monoclines are preserved as areas of normal drag. Therefore, the orientation and magnitude of bed dips within and adjacent to a fault zone, and the numbers of segments seen on a cross-section through it, depend largely on the aspect ratios of relay ramps in the initial fault array. The aspect ratio of relay ramps varies between different fault systems. An analysis of the geometry of 512 relay ramps from 13 different fault systems suggests that the main controls on aspect ratio are the strength of the sequence at the time of faulting and the underlying structure.

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Contents

Geological Society, London, Special Publications

The Geometry and Growth of Normal Faults

C. Childs
C. Childs
University College Dublin, Ireland
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R. E. Holdsworth
R. E. Holdsworth
University of Durham, UK
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C. A.-L. Jackson
C. A.-L. Jackson
Imperial College, UK
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T. Manzocchi
T. Manzocchi
University College Dublin, Ireland
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J. J. Walsh
J. J. Walsh
University College Dublin, Ireland
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G. Yielding
G. Yielding
Badley Geoscience Ltd, UK
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Geological Society of London
Volume
439
ISBN electronic:
9781862399716
Publication date:
January 01, 2017

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