Ohuka landslide, New Zealand: a low angle bedding-controlled coastal landslide at Port Waikato, North Island, New Zealand

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dc.contributor.author Bevan, David
dc.contributor.author Beresford, Joanna
dc.contributor.author Arthurs, James
dc.contributor.author Gasston, Caleb
dc.contributor.author Brook, Martin S
dc.contributor.author Prebble, Warwick
dc.contributor.author Brideau, Marc-Andre
dc.date.accessioned 2021-11-17T22:02:01Z
dc.date.available 2021-11-17T22:02:01Z
dc.date.issued 2021-1-6
dc.identifier.issn 0028-8306
dc.identifier.uri https://hdl.handle.net/2292/57477
dc.description.abstract Overseas, relict deep-seated coastal landslides have attracted significant analysis because of potential hazards caused by sea level rise and climate change. Despite the rapid growth in the Auckland region, regional coastal landslide hazards are poorly understood. We investigated the geomorphology and material properties of Ohuka coastal landslide on the southwestern coastline of the Auckland region, to better understand the failure mechanism. The site is formed on weak Neogene sediments of varying lithological properties, with very low angles of dip, exposed on both the seaward (west) and landward (east) flanks of Ohuka Hill. Displacement appears to have been rotational, along a low-angled basal shear surface, the Koheroa Clay Seam. The surface geomorphology consists of discontinuous uphill-facing scarplets indictive of rotational slump blocks, along the basal shear surface. However, the preservation of slump block surface topography is hindered due to the lack of a thick, strong caprock, and high annual rainfall (1400 mm), and erosion. The proposed failure mechanism and general geometry is consistent with correlations between graben width and depth to failure plane reported from bedding-controlled coastal landslides formed on low dip angles in southern England. This provides important context, given the paucity of New Zealand bedding-controlled coastal landslide case studies.
dc.language en
dc.publisher Informa UK Limited
dc.relation.ispartofseries New Zealand Journal of Geology and Geophysics
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
dc.subject Science & Technology
dc.subject Physical Sciences
dc.subject Geology
dc.subject Geosciences, Multidisciplinary
dc.subject Landslide
dc.subject coastal
dc.subject clay seam
dc.subject bedding-plane failure
dc.subject low angle
dc.subject 0403 Geology
dc.subject 0404 Geophysics
dc.subject 0406 Physical Geography and Environmental Geoscience
dc.title Ohuka landslide, New Zealand: a low angle bedding-controlled coastal landslide at Port Waikato, North Island, New Zealand
dc.type Journal Article
dc.identifier.doi 10.1080/00288306.2020.1865414
pubs.begin-page 1
dc.date.updated 2021-10-12T09:21:07Z
dc.rights.holder Copyright: The author en
pubs.author-url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000605430700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e41486220adb198d0efde5a3b153e7d
pubs.end-page 16
pubs.publication-status Published online
dc.rights.accessrights http://purl.org/eprint/accessRights/RetrictedAccess en
pubs.subtype Article
pubs.subtype Early Access
pubs.subtype Journal
pubs.elements-id 836468
dc.identifier.eissn 1175-8791
pubs.online-publication-date 2021-1-6

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