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Article: Stress and fault parameters affecting fault slip magnitude and activation time during a glacial cycle

TitleStress and fault parameters affecting fault slip magnitude and activation time during a glacial cycle
Authors
KeywordsGlacial isostatic adjustment
Geodynamics
Finite element modeling
Fault mechanics
Glacially induced faults
Issue Date2014
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/
Citation
Tectonics, 2014, v. 33 n. 7, p. 1461-1476 How to Cite?
AbstractThe growing and melting of continental ice sheets during a glacial cycle is accompanied by stress changes and reactivation of faults. To better understand the relationship between stress changes, fault activation time, fault parameters, and fault slip magnitude, a new physics‐based two‐dimensional numerical model is used. In this study, tectonic background stress magnitudes and fault parameters are tested as well as the angle of the fault and the fault locations relative to the ice sheet. Our results show that fault slip magnitude for all faults is mainly affected by the coefficient of friction within the crust and along the fault and also by the depth of the fault tip and angle of the fault. Within a compressional stress regime, we find that steeply dipping faults (∼75°) can be activated after glacial unloading, and fault activity continues thereafter. Furthermore, our results indicate that low‐angle faults (dipping at 30°) may slip up to 63m, equivalent to an earthquake with a minimum moment magnitude of 7.0. Finally, our results imply that the crust beneath formerly glaciated regions was close to a critically stressed state, in order to enable activation of faults by small changes in stress during a glacial cycle.
Persistent Identifierhttp://hdl.handle.net/10722/202772
ISSN
2019 Impact Factor: 3.543
2015 SCImago Journal Rankings: 2.628
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorSteffen, R-
dc.contributor.authorSteffen, H-
dc.contributor.authorWu, P-
dc.contributor.authorEaton, DW-
dc.date.accessioned2014-09-19T10:03:21Z-
dc.date.available2014-09-19T10:03:21Z-
dc.date.issued2014-
dc.identifier.citationTectonics, 2014, v. 33 n. 7, p. 1461-1476-
dc.identifier.issn0278-7407-
dc.identifier.urihttp://hdl.handle.net/10722/202772-
dc.description.abstractThe growing and melting of continental ice sheets during a glacial cycle is accompanied by stress changes and reactivation of faults. To better understand the relationship between stress changes, fault activation time, fault parameters, and fault slip magnitude, a new physics‐based two‐dimensional numerical model is used. In this study, tectonic background stress magnitudes and fault parameters are tested as well as the angle of the fault and the fault locations relative to the ice sheet. Our results show that fault slip magnitude for all faults is mainly affected by the coefficient of friction within the crust and along the fault and also by the depth of the fault tip and angle of the fault. Within a compressional stress regime, we find that steeply dipping faults (∼75°) can be activated after glacial unloading, and fault activity continues thereafter. Furthermore, our results indicate that low‐angle faults (dipping at 30°) may slip up to 63m, equivalent to an earthquake with a minimum moment magnitude of 7.0. Finally, our results imply that the crust beneath formerly glaciated regions was close to a critically stressed state, in order to enable activation of faults by small changes in stress during a glacial cycle.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/-
dc.relation.ispartofTectonics-
dc.rights©2014. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1002/2013TC003450.-
dc.subjectGlacial isostatic adjustment-
dc.subjectGeodynamics-
dc.subjectFinite element modeling-
dc.subjectFault mechanics-
dc.subjectGlacially induced faults-
dc.titleStress and fault parameters affecting fault slip magnitude and activation time during a glacial cycle-
dc.typeArticle-
dc.identifier.emailWu, P: ppwu@hku.hk-
dc.identifier.authorityWu, P=rp01830-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1002/2013TC003450-
dc.identifier.scopuseid_2-s2.0-84905292942-
dc.identifier.hkuros235510-
dc.identifier.volume33-
dc.identifier.issue7-
dc.identifier.spage1461-
dc.identifier.epage1476-
dc.identifier.isiWOS:000340545400013-
dc.publisher.placeUnited States-

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