CHBDC HDC WDC Liquefaction Severity

This vector dataset contains the liquefaction hazard maps for Wairoa, Central Hawke's Bay and Hastings districts based on geotechnical interpretaion of geological maps, shallow groundwater surface modelling, available geotechnical data on the NZGD and probabilistic seismic hazard model information. Refer to Sections 6.2 to 6.4 of Rosser and Dellow et al (2017) for a detailed description of the liquefaction hazard mapping methodology.This data can be used to understand the variation, spatially and temporally of liquefaction hazards in Hawke's Bay. The current maps are necessarily conservative to address the uncertainties in the data sources.This includes, for the Wairoa District Council, Central Hawke’s Bay District Council and Hastings District Council (outside the Heretaunga Plains), a buffer zone added to all the polygons identified as having a liquefaction hazard. This includes, for the Wairoa District Council, Central Hawke’s Bay District Council and Hastings District Council (outside the Heretaunga Plains), a buffer zone added to all the polygons identified as having a liquefaction hazard. The width of this buffer zone is 500 m (+/- 250 m) and allows for the differences between the accuracy of lines on a geological map at a scale of 1:250,000 (+/- 250 m) and the greater accuracy of property boundaries on cadastral maps to be reconciled. If a property is located wholly or partially within the buffer zone this indicates that there is uncertainty about the level of liquefaction hazard. Site specific assessments (ranging from visual inspection through to ground investigations) will be needed to determine the level of liquefaction hazard. If a buffer zone boundary line falls across a property it should initially be treated as being part of the higher hazard class for the purpose of interpreting the map. As additional subsurface and groundwater data becomes available and the science of liquefaction prediction improves the maps presented in this report will need review and revision. The liquefaction planning maps for Wairoa District, Central Hawke's Bay District and Hastings District (beyond the Heretaunga Plains) are not suitable for use in conjunction with their respective district plans because of the scale difference between the underpinning geological maps (1:250,000) used to delineate the liquefaction susceptibility and most district plan maps (1:1500 to 1:25,000) and the limited datasets used to compile the maps.

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Author Hawkes Bay Regional Council
Maintainer Hellen Munro
Maintainer Email Hellen Munro
Source http://opendata-hbrc.opendata.arcgis.com/datasets/53a60e8296764f879eed707bee61fd0b_4
Created 2017-11-30T22:21:22.000Z
Date modified 2019-06-07T03:43:18.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[176.3632, -40.424], [178.0013, -40.424], [178.0013, -38.6102], [176.3632, -38.6102], [176.3632, -40.424]]]}
Source Identifier http://opendata-hbrc.opendata.arcgis.com/datasets/53a60e8296764f879eed707bee61fd0b_4
Record created March 19, 2018, Last Updated June 10, 2019