Geometrical analysis of the refraction and segmentation of normal faults in periodically layered sequences

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dc.contributor.authorSchöpfer, Martin P. J.-
dc.contributor.authorChilds, Conrad-
dc.contributor.authorWalsh, John J.-
dc.contributor.authorManzocchi, Tom-
dc.contributor.authorKoyi, Hemin A.- Elsevier Ltd.en
dc.identifier.citationJournal of Structural Geologyen
dc.description.abstractNormal faults contained in multilayers are often characterised by dip refraction which is generally attributed to differences in the mechanical properties of the layers, sometimes leading to different modes of fracture. Because existing theoretical and numerical schemes are not yet capable of predicting the 3D geometries of normal faults through inclined multilayer sequences, a simple geometric model is developed which predicts that such faults should show either strike refraction or fault segmentation or both. From a purely geometrical point of view a continuous refracting normal fault will exhibit strike (i.e. map view) refraction in different lithologies if the intersection lineation of fault and bedding is inclined. An alternative outcome of dip refraction in inclined multilayers is the formation of segmented faults exhibiting en échelon geometry. The degree of fault segmentation should increase with increasing dip of bedding, and a higher degree of segmentation is expected in less abundant lithologies. Strike changes and associated fault segmentation predicted by our geometrical model are tested using experimental analogue modelling. The modelling reveals that normal faults refracting from pure dip-slip predefined faults into an overlying (sand) cover will, as predicted, exhibit systematically stepping segments if the base of the cover is inclined.en
dc.description.sponsorshipIrish Research Council for Science, Engineering and Technologyen
dc.format.extent3479339 bytes-
dc.rightsThis is the author’s version of a work that was accepted for publication in Journal of Structural Geology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Structural Geology Volume 29, Issue 2, February 2007, Pages 318-335 DOI#: 10.1016/j.jsg.2006.08.006 .en
dc.subjectFault geometryen
dc.subjectFault refractionen
dc.subjectFault segmentationen
dc.subjectEn échelonen
dc.subjectSandbox modellingen
dc.subject.lcshFaults (Geology)en
dc.subject.lcshGeology, Structuralen
dc.subject.lcshGeometrical modelsen
dc.titleGeometrical analysis of the refraction and segmentation of normal faults in periodically layered sequencesen
dc.typeJournal Articleen
dc.internal.availabilityFull text availableen
dc.statusPeer revieweden
dc.neeo.contributorSchöpfer|Martin P. J.|aut|-
dc.neeo.contributorWalsh|John J.|aut|-
dc.neeo.contributorKoyi|Hemin A.|aut|-
dc.description.othersponsorshipEnterprise Irelanden
item.fulltextWith Fulltext-
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