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

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dc.citation.firstpage872
dc.citation.issueNumber9
dc.citation.journalTitleGeology
dc.citation.lastpage876
dc.citation.volumeNumber47
dc.contributor.authorFagereng, Å
dc.contributor.authorSavage, H.M.
dc.contributor.authorMorgan, J.K.
dc.contributor.authorWang, M.
dc.contributor.authorMeneghini, F.
dc.contributor.authorBarnes, P.M.
dc.contributor.authorBell, R.
dc.contributor.authorKitajima, H.
dc.contributor.authorMcNamara, D.D.
dc.contributor.authorSaffer, D.M.
dc.contributor.authorWallace, L.M.
dc.contributor.authorPetronotis, K.
dc.contributor.authorLeVay, L.
dc.date.accessioned2019-11-14T17:52:17Z
dc.date.available2019-11-14T17:52:17Z
dc.date.issued2019
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.
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.
dc.identifier.digital872
dc.identifier.doihttps://doi.org/10.1130/G46367.1
dc.identifier.urihttps://hdl.handle.net/1911/107675
dc.language.isoeng
dc.publisherThe Geological Society of America
dc.rightsGold Open Access: This paper is published under the terms of the CC-BY license.
dc.titleMixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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