20210903 09561900 1.0 FALSE Liquefaction 1704081.593400 1828979.129000 5871374.977100 6025017.533100 1 002 Projected GCS_NZGD_2000 Linear Unit: Meter (1.000000) NZGD_2000_New_Zealand_Transverse_Mercator <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/2.6.0'><WKT>PROJCS["NZGD_2000_New_Zealand_Transverse_Mercator",GEOGCS["GCS_NZGD_2000",DATUM["D_NZGD_2000",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",1600000.0],PARAMETER["False_Northing",10000000.0],PARAMETER["Central_Meridian",173.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",2193]]</WKT><XOrigin>-4020900</XOrigin><YOrigin>1900</YOrigin><XYScale>10000</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>2193</WKID><LatestWKID>2193</LatestWKID></ProjectedCoordinateSystem> 20220705 17280000 20220805 13174400 150000000 5000 ItemDescription This layer allows viewing of liquefaction vulnerability. This represents the potential for liquefaction damage to an area when an earthquake strikes based on physical parameters such as soil type, particle size, density and depth to ground water. This liquefaction assessment has been undertaken in general accordance with the guidance document ‘Assessment of Liquefaction-Induced Ground Damage to Inform Planning Processes’ published by the Ministry of Business, Innovation and Employment in 2017. <DIV STYLE="text-align:Left;"><DIV><DIV>Liquefaction Assessment Study Level of Detail:<A href="https://www.building.govt.nz:443/building-code-compliance/geotechnical-education" target="_blank" STYLE="text-decoration:underline;">https://www.building.govt.nz/building-code-compliance/geotechnical-education</A>Level A - Basic Desktop AssessmentConsiders only the most basic information about geology, groundwater and seismic hazard to assess the potential for liquefaction to occur. This has been completed as a simple ‘desktop study’, based on existing information (geological and topographic maps) and local knowledge.Residual uncertainty: The primary focus is identification of land where there is a high degree of certainty that Liquefaction Damage is Unlikely. For other areas, substantial uncertainty will likely remain regarding the level of risk.Level B - Calibrated desktop assessmentA high-level ‘calibration’ of geological/geomorphic maps. Qualitative assessment of a small number of subsurface investigations provides a better understanding of liquefaction susceptibility and triggering for the mapped deposits and underlying ground profile.Residual uncertainty: Because of the limited amount of subsurface ground information, significant uncertainty remains regarding the level of liquefaction-related risk, how it varies across each mapped area, and the delineation of boundaries between different areasVariabilityThere is considerable uncertainty involved in estimating liquefaction-induced ground damage. These categories are intended to provide a general indication of the damage that might typically be expected. However there can be wide variation in land performance, even where ground conditions appear to be similar, with damage in some cases being much greater or less than inferred from the damage category.Description of uncertaintiesThis assessment has been made at a broad scale across the entire Auckland Council territorial authority area and is intended to approximately describe the typical range of liquefaction across neighborhood-sized areas. It is not intended to precisely describe liquefaction at individual property scale. This information is general in nature, and more detailed site-specific liquefaction assessment will be required for some purposes (e.g. for design of building foundations).<TABLE><TBODY><TR><TD>Liquefaction Category</TD><TD>Description </TD></TR><TR><TD>Liquefaction Category is Undetermined </TD><TD>A liquefaction vulnerability category has not been assigned at this stage, either because a liquefaction assessment has not been undertaken for this area, or there is not enough information to determine the appropriate category with the required level of confidence. </TD></TR><TR><TD>Liquefaction Damage is Unlikely </TD><TD>There is a probability of more than 85 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. At this stage there is not enough information to distinguish between Very Low and Low. More detailed assessment would be required to assign a more specific liquefaction category. </TD></TR><TR><TD>Liquefaction Damage is Possible </TD><TD>There is a probability of more than 15 percent that liquefaction-induced ground damage will be Minor to Moderate (or more) for 500-year shaking. At this stage there is not enough information to distinguish between Medium and High. More detailed assessment would be required to assign a more specific liquefaction category. </TD></TR><TR><TD>Very Low Liquefaction Vulnerability</TD><TD>There is a probability of more than 99 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. </TD></TR><TR><TD>Low Liquefaction Vulnerability </TD><TD>There is a probability of more than 85 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. </TD></TR><TR><TD>Medium Liquefaction Vulnerability </TD><TD>There is a probability of more than 50 percent that liquefaction-induced ground damage will be: <UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI>Minor to Moderate (or less) for 500-year shaking; and </LI><LI>None to Minor for 100-year shaking. </LI></UL></TD></TR><TR><TD>High Liquefaction Vulnerability </TD><TD>There is a probability of more than 50 percent that liquefaction-induced ground damage will be: <UL STYLE="margin:0 0 0 0;padding:0 0 0 0;"><LI>Moderate to Severe for 500-year shaking; and/or </LI><LI>Minor to Moderate (or more) for 100-year shaking. </LI></UL></TD></TR></TBODY></TABLE>Terms of use:It is important to recognize that these maps are prepared to a city-wide scale and are not intended to provide assessment specific to any one property. Nor does it replace the need for site-specific investigations required for land and building development processes under the Resource Management Act and Building Act.The maps are prepared based on an assessment of natural ground conditions and therefore do not take into account the influence of recent human activities that may influence liquefaction response (i.e. earthworks, ground improvement, foundation design), unless specifically stated within the technical reports. As such, degree of land damage may be less than predicted for a given property where liquefaction risk was addressed during landform or building foundation design.</DIV></DIV></DIV> "Liquefaction Vulnerability Maps for the Auckland Region" Report by Omer Altaf, Liam Wotherspoon, Rolando Orense. University of Auckland Uniservices V 0.2 LiquefactionGeologyGeotechnicalGeology and Geotechnical Esri ArcGIS 12.6.3.24783 Liquefaction - Basic Assessment 1 174.153543 175.582624 -35.892357 -37.298426 <DIV STYLE="text-align:Left;"><DIV><DIV STYLE="font-size:12pt">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 <A href="https://www.aucklandcouncil.govt.nz/geospatial/how-to-use-council-open-data/Pages/user-licence-auckland-council-open-data.aspx" STYLE="text-decoration:underline;">Creative Commons Attribution 4.0 International licence</A>. 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> Liquefaction Feature Class 0 OBJECTID OBJECTID OID 4 0 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. SHAPE SHAPE Geometry 0 0 0 Feature geometry. Esri Coordinates defining the features. LiquefactionAssessmentLevel LiquefactionAssessmentLevel String 5 0 0 Vulnerability Vulnerability String 20 0 0 VulnerabilityDescription VulnerabilityDescription String 50 0 0 DataSource DataSource String 254 0 0 RecordStatus RecordStatus String 10 0 0 MaintenanceComment MaintenanceComment String 254 0 0 created_user created_user String 50 0 0 created_date created_date Date 8 0 0 last_edited_user last_edited_user String 50 0 0 last_edited_date last_edited_date Date 8 0 0 VALIDATIONSTATE VALIDATIONSTATE SmallInteger 2 0 0 SHAPE_Length SHAPE_Length Double 8 0 0 Length of feature in internal units. Esri Positive real numbers that are automatically generated. SHAPE_Area SHAPE_Area Double 8 0 0 Area of feature in internal units squared. Esri Positive real numbers that are automatically generated. File Geodatabase Feature Class dataset EPSG 7.9.4(9.0.0) 0 Simple FALSE 0 TRUE FALSE 20220805