Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand

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dc.citation.firstpage872en_US
dc.citation.issueNumber9en_US
dc.citation.journalTitleGeologyen_US
dc.citation.lastpage876en_US
dc.citation.volumeNumber47en_US
dc.contributor.authorFagereng, Åen_US
dc.contributor.authorSavage, H.M.en_US
dc.contributor.authorMorgan, J.K.en_US
dc.contributor.authorWang, M.en_US
dc.contributor.authorMeneghini, F.en_US
dc.contributor.authorBarnes, P.M.en_US
dc.contributor.authorBell, R.en_US
dc.contributor.authorKitajima, H.en_US
dc.contributor.authorMcNamara, D.D.en_US
dc.contributor.authorSaffer, D.M.en_US
dc.contributor.authorWallace, L.M.en_US
dc.contributor.authorPetronotis, K.en_US
dc.contributor.authorLeVay, L.en_US
dc.date.accessioned2019-11-14T17:52:17Zen_US
dc.date.available2019-11-14T17:52:17Zen_US
dc.date.issued2019en_US
dc.description.abstractGeophysical observations show spatial and temporal variations in fault slip style on shallow subduction thrust faults, but geological signatures and underlying deformation processes remain poorly understood. International Ocean Discovery Program (IODP) Expeditions 372 and 375 investigated New Zealand’s Hikurangi margin in a region that has experienced both tsunami earthquakes and repeated slow-slip events. We report direct observations from cores that sampled the active Pāpaku splay fault at 304 m below the seafloor. This fault roots into the plate interface and comprises an 18-m-thick main fault underlain by ∼30 m of less intensely deformed footwall and an ∼10-m-thick subsidiary fault above undeformed footwall. Fault zone structures include breccias, folds, and asymmetric clasts within transposed and/or dismembered, relatively homogeneous, silty hemipelagic sediments. The data demonstrate that the fault has experienced both ductile and brittle deformation. This structural variation indicates that a range of local slip speeds can occur along shallow faults, and they are controlled by temporal, potentially far-field, changes in strain rate or effective stress.en_US
dc.identifier.citationFagereng, Å, Savage, H.M., Morgan, J.K., et al.. "Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand." <i>Geology,</i> 47, no. 9 (2019) The Geological Society of America: 872-876. https://doi.org/10.1130/G46367.1.en_US
dc.identifier.digital872en_US
dc.identifier.doihttps://doi.org/10.1130/G46367.1en_US
dc.identifier.urihttps://hdl.handle.net/1911/107675en_US
dc.language.isoengen_US
dc.publisherThe Geological Society of Americaen_US
dc.rightsGold Open Access: This paper is published under the terms of the CC-BY license.en_US
dc.titleMixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealanden_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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