20250916 14491900 1.0 TRUE https://www.arcgis.com/sharing/rest/content/items/0d83cc4836f04620b77c31e802114288/info/thumbnail/thumbnail1757996310303.png Large Scale Landslide Susceptibility - Level A Analysis 2025 Landslide Susceptibility Landslides Geology (Purpose): Two distinct maps were developed to reflect different landslide types: small-scale shallow landslides and large-scale or deep-seated landslides. The map provided in this dataset relates to large-scale landslides. These are geomorphic features that span most or all a hillslope, influenced by deeper geological structures, groundwater conditions, and longer-term landscape processes such as tectonic uplift, fluvial incision, and volcanic or earthquake activity. The map classifies land into five susceptibility levels based on geological, topographical, hydrological, and land use data. The term 'susceptibility' should not be confused with 'hazard' and 'risk'. Landslide Susceptibility is a way of assessing the potential for a landslide to occur in future. It does not say when a landslide would occur, or how likely it is, but simply identifies which areas are more likely to experience a landslide. This Level A analysis, aligned with GNS Landslide Planning Guidelines, is intended as a regional overview and does not replace site-specific assessments. The mapping was developed by WSP under the direction of Auckland Council geological and geotechnical staff and reviewed by a panel of experts. Refer to Technical Report TR2025/7 “Auckland Region Landslide Susceptibility Assessment” on Knowledge Auckland for further information. Auckland Region Landslide Susceptibility Mapping – Large Scale Landslides 2025The Auckland Region Landslide Susceptibility Mapping identifies areas more or less prone to landslides, supporting proactive land-use and risk-reduction planning. This gives us an understanding of ‘what could go wrong where’ (susceptibility) but not ‘how often might this occur’ (hazard).Landslides are one of New Zealand’s – and Auckland’s - most significant natural hazards. Auckland Council has a range of strategies to proactively manage the risk from natural hazards and enhance the resilience of the region to these hazards, including landslides. As experienced in the 2023 storm events, landslides present a life safety risk, adversely affect property and infrastructure, and may damage or destroy cultural and environmental sites.Lineage:This study was carried out using a computer‑generated model and datasets covering the entire region. Some limited onsite checks were done in selected areas to validate the results, but this did not include assessments of individual private properties.The methodology used to identify these areas is presented in Auckland Council Technical Report TR2025/7 “Auckland Region Landslide Susceptibility Assessment” available on the Knowledge Auckland website.<a href='https://www.knowledgeauckland.org.nz/publications/auckland-region-landslide-susceptibility-assessment-may-2025/' rel='nofollow ugc'>https://www.knowledgeauckland.org.nz/publications/auckland-region-landslide-susceptibility-assessment-may-2025/</a>Citation Dates:Creation Date: 05/03/2025Update Cycle:Adhoc 5-10 years. These maps will be updated when budgets permit. Auckland Council is working with Earth Sciences New Zealand on more efficient mapping approaches which might enable us to do these studies more quickly and efficiently in future.Resource Contact:Organisation: Auckland CouncilPosition: Chief Engineer, Natural Hazards Team LeadContact Role: CustodianContact email: naturalhazards@aucklandcouncil.govt.nzConstraints – General Constraints:These maps are compiled from a statistical method of available data, and do not represent site specific assessment. They are not intended to be viewed or relied upon on at a property-level scale. These maps provide a starting point to identify if it is appropriate to engage specialists to assess the risk at a more detailed level. However, they should not be taken as showing a confirmed problem without more detailed assessment because they rely on data like geological maps which are not always accurate at a site-specific level.The landslide susceptibility mapping completed in this study represents a desk-based, region-wide assessment that was carried out from examination of remotely sensed data including LiDAR and aerial imagery, along with regional-scale datasets. The susceptibility analysis was undertaken using geomorphic slope units as the mapping basis.No access was gained to properties, and site-specific stability assessments have not been undertaken. Property owners and developers should seek independent advice from a suitably qualified Geotechnical Professional (PEngGeol and/or CPEng) with appropriate relevant experience, on land stability at their particular property when considering development or the existing level of slope instability hazard.The Large Scale Landslide Susceptibility map is included on LIMs. On the LIM map, the five susceptibility classes are represented as a range from Class 1-5, instead of very low to very high susceptibility.The zoom restriction is limited to 1:7,500 to 101,000 on GeoMaps. This enables users to locate their sites of interest. Use of this data is not recommended at a scale more zoomed in than 1:50,000. Users should zoom out after identifying their site when using this dataset.When sharing/viewing the data through Open Data a scale of 1:50,000 to 1:101,000 is recommended (as mentioned in the original report)Where water bodies exist (mapped or not), no susceptibility is assumed.Refer to Technical Report on Knowledge Auckland for full details on limitations.Constraints – Legal Constraints:These maps are a way of assessing which areas are more likely to experience a landslide – not per property. The maps will be used to inform future changes to the Unitary Plan, will be shown on LIMs to inform future owners of the potential hazard, and will be used in decision-making for council when identifying areas for development or for building our assets.Use Constrains: StatutoryAccess Constrains: UnrestrictedConstraints – Security:Creative Commons Engineering, Assets and Technical Advisory Department <DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV>This website and datasets are provided by Auckland Council as a public service and may be used for personal and business purposes. They are provided under the Creative Commons Attribution 4.0 International licence. You are not permitted to copy or republish any substantial amount of the information from this website without the prior written consent of Auckland Council. Information on this website has been derived from various sources, including Auckland Council’s databases. While due care has been taken in providing this website, all information should be considered as being illustrative and indicative only. Your use of information from this website is entirely at your own risk. Datasets are updated regularly when new information becomes available. As such, downloading and copying activities may result in data invalidity.  Auckland Council does not give and expressly disclaims any warranty as to the accuracy or completeness of the information or its fitness for any purpose. Auckland Council accepts no liability for any error, omission, or inaccuracy of the information or from any use of or reliance on the information provided by this website. You should independently verify the accuracy of any information before taking any action in reliance upon it. You waive and release Auckland Council from any claims arising from your use of this website or the information provided by it. You indemnify Auckland Council against all claims, loss or damages arising in connection with your use of this website or the information provided by it. Information from this web site may not be used for the purposes of any legal disputes.</DIV></DIV></DIV> 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