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dc.contributor.authorHealy, D.
dc.contributor.authorBlenkinsop, T.
dc.contributor.authorTimms, Nicholas Eric
dc.contributor.authorMeredith, P.
dc.contributor.authorMitchell, T.
dc.contributor.authorCooke, M.
dc.date.accessioned2017-01-30T11:37:14Z
dc.date.available2017-01-30T11:37:14Z
dc.date.created2015-10-29T04:09:13Z
dc.date.issued2015
dc.identifier.citationHealy, D. and Blenkinsop, T. and Timms, N.E. and Meredith, P. and Mitchell, T. and Cooke, M. 2015. Polymodal faulting: Time for a new angle on shear failure. Journal of Structural Geology. 80: pp. 57-71.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/13460
dc.identifier.doi10.1016/j.jsg.2015.08.013
dc.description.abstract

Conjugate, or bimodal, fault patterns dominate the geological literature on shear failure. Based on Anderson's (1905) application of the Mohr-Coulomb failure criterion, these patterns have been interpreted from all tectonic regimes, including normal, strike-slip and thrust (reverse) faulting. However, a fundamental limitation of the Mohr-Coulomb failure criterion – and others that assume faults form parallel to the intermediate principal stress, σ2 – is that only plane strain can result from slip on the conjugate faults. However, deformation in the Earth is widely accepted as being three-dimensional, with truly triaxial stresses (σ1 > σ2 > σ3) and strains. Polymodal faulting, with three or more sets of faults forming and slipping simultaneously, can generate three-dimensional strains from truly triaxial stresses. Laboratory experiments and outcrop studies have verified the occurrence of polymodal fault patterns in nature. These fault patterns present a fundamental challenge to our understanding of shear failure in rocks (and other materials) and an opportunity to improve our understanding of seismic hazards and fluid flow in the subsurface. In this review, we assess the published evidence, theories and models for polymodal faulting before suggesting ways to produce a truly general and valid failure criterion for triaxial failure.

dc.publisherElsevier Ltd
dc.titlePolymodal faulting: Time for a new angle on shear failure
dc.typeJournal Article
dcterms.source.volume80
dcterms.source.startPage57
dcterms.source.endPage71
dcterms.source.issn0191-8141
dcterms.source.titleJournal of Structural Geology
curtin.note

This open access article is distributed under the Creative Commons license http://creativecommons.org/licenses/by-nc-nd/4.0/

curtin.departmentDepartment of Applied Geology
curtin.accessStatusOpen access


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