This Combined Earthquake hazard shapefile is a compilation of all "combined earthquake hazard" ArcInfo coverages in major urban areas of the Wellington Region. The coverages represent overlays of all previous earthquake hazard data.1: Area of tsunami inundation2: 20m buffer along major fault traces3: Ground shaking4: Liquefaction potential5:Slope failure.The data was calculated using the following methodology:A 2-D database table (cell table, with 10m grids) that covers each map area was constructed. At the centroid of each cell, the relevant Arc-Info polygon attributes was assigned to a field corresponding to each hazard polygon. Calculations between each of these fields were carried out on a record by record (or grid centroid) basis.The calculations then followed for each hazard:• calculate the damage for each item of infrastructure for each hazard, based on the damage ratios given in Tables 6 through 10.• modify the liquefaction damage based on an assessed likelihood that liquefaction will occur in the area• total the damage for each hazard• add the damage for each hazard at each cell centroid to get the total damage due to combinations of hazard, a combined hazard index (CHI).These CHI values were then grouped into the severity using the CHI_HAZ_GR field, which was symbolised as the SEVERITY field. Map publication reference: WRC/RP-T-96/15 For notes on how this coverage was created refer to: Mapping methodology and Risk Mitigation Measures Publication: WRC/RP-T-96/22. Refer also to Consultant Ian R Brown Associates at www.irba.co.nz/.

The occurrence of earthquakes in the Wellington Region is inevitable due to its location at the boundary of two crustal plates. Earthquakes have the potential to cause significant adverse effects within the Region, including loss of life, injury, and social and economic disruption. This data shows the levels of liquefaction risk for the region based on pre-existing datasets. Liquefaction risk is related to the type of soils present. This data shows the locations of soils that have a siginificnt risk of liquefaction occuring and the level of that risk for the entire region. This data is based on exisitng geological maps published by GNS and similar investigations. This limits the usale scales of the data to between 1:50,000 and 1:250,000. Use at larger scales requires more detailed investigations first.This data is best used in conjunction with the report from GNS refered to below. It is available to download from the GNS website.Dellow, G.D.; Perrin, N.D.; Ries, W.F. 2018 Liquefaction hazard in the Wellington region. Lower Hutt, N.Z.: GNS Science. GNS Science report 2014/16. 71 p.; doi:10.21420/G28S8J

The occurrence of earthquakes in the Wellington Region is inevitable due to its location at the boundary of two crustal plates. Earthquakes have the potential to cause significant adverse effects within the Region, including loss of life, injury, and social and economic disruption. In recognition of these potential effects, the Wellington Regional Council initiated a project in 1988 to:Assess the risks posed by earthquakes.Identify mitigation options.Implement measures to ensure that the level of risk is acceptable.The purpose of the dataset is to show the geographic variation in ground shaking hazard that could be expected during certain earthquake events.Information on active faults in the western part of the Region has been published in a map series by the Wellington Regional Council - Major Active Faults of the Wellington Region (Map sheets 1, 2 and 3: 1991). Tsunami hazard information for Wellington Harbour is also available.The geographic variation in earthquake ground shaking was defined using geological and geotechnical information from drillhole logs, microearthquake records, strong motion earthquake records, penetrometer logs and gravity surveys. Numerical techniques to model the seismic response of sediments were also used.Based on the distribution of geological materials and the measured response of these materials to seismic waves the Lower Hutt study area was mapped into four ground shaking hazard zones; Zone 1, Zone 2, Zone 3-4, and Zone 5Zone 1, the least hazardous zone, is characteristically underlain by bedrock, and typically shows very low to low amplification of seismic waves.Zone 2 areas are underlain by firm material, including compact gravel and stiff to hard clay or less than 5 metres of soft and/or loose material, and show lowto moderate amplification of earthquake shaking relative to bedrock.Zone 3-4 represents a transition zone between the low to moderate amplification of ground shaking anticipated in Zone 2, and the high to very high amplification anticipated in Zone 5. Zone 3-4 areas are typically underlain by 5 to 10 metres of near surface soft and/or loose material and are characterised by moderate to high amplification of earthquake ground motion relative to bedrock.Zone 5 areas are underlain by more than 10 metres of soft and/or loose material. These materials generally have shear wave velocities in the order of 200 metres/second or less. Zone 5 areas are characterised by high to very high amplification of earthquake ground motion, relative to bedrock and are therefore subject to the greatest ground shaking hazard.This map is accompanied by notes in Publication WRC/PP-T-92/45.

Data has been created from hosted feature service (https://mapping.gw.govt.nz/arcgis/rest/services/GW/NRPMap_P_operative/MapServer). It has been shared to the Open Data Portal. Schedule F1- Rivers and lakes with significant indigenous ecosystemsWaterbodies (rivers, streams and their tributaries and Lake Wairarapa) with habitat for threatened and at risk indigenous fish species within the Greater Wellington Region.These species are named in Schedule F1.Schedule F1 replicates Table 16 of the Regional Policy Statement for the Wellington Region, based on Warr et al (2009), and updated with recommendations in Perrie et al (2014). Perrie A, Greenfield S, Beaglehole J. (2014). Rivers and lakes with significant indigenous ecosystems. Greater Wellington Regional Council, Publication No. GW/EP-G-14/93, Wellington.Warr S, Perrie A and McLea M. (2009). Selection of rivers and lakes with significant indigenous ecosystems. Greater Wellington Regional Council, Publication No. GW/EP-G-09/29, Wellington.

The map shows the 1% AEP RCP 8.5+. This is a representation of severe flood hazard exposure, with significant climate change impacts. The undefended case removes levees from the model. This gives a representation of the population at risk. Defences can be breached, which is why this is important to consider for exposure analysis for planning and emergency management. The ground survey or Digital Elevation Model (DEM) used in this model is derived from LiDAR captured in 2013/2014 with a 1m horizontal resolution. Modelling accuracy is expected to be reduced around features (channels, embankments) smaller than 20m, and is mapped to a 5m resolution. The model does sample the LiDAR at a higher resolution to conveyance characteristics of the higher resolution LiDAR. A static tidal boundary has been adopted for this assessment which does not take varying tidal conditions into consideration, but does consider extreme sea level impacts like storm surge. The model includes stormwater flooding but is less accurate in urban catchments. This model considers all catchments not just those with Greater Wellington flood protection schemes in place.

The active fault data displayed here are from a variety of sources. It includes the New Zealand Active Faults Database (NZAFD) which comes in two versions - 1:250,000 scale (NZAFD-AF250) and a high-resolution scale (NZAFD-HighRes) – and is prepared by the Institute of Geological and Nuclear Sciences Limited (GNS Science). The active fault datasets also include Fault Avoidance Zones (FAZs) and Fault Awareness Areas (FAAs). The NZAFD-AF250 database covers New Zealand mainland, while the NZAFD-HighRes database, FAZs and FAAs are only available for restricted areas of New Zealand (updated periodically and without prior notification). If the FAZs are used to assist future land use planning, this should be done in accordance with the Ministry for the Environment "Planning for Development on or Close to Active Faults" (Kerr et al. 2003). The FAAs show where there may be a surface fault rupture hazard, but further work is needed to define a FAZ, and it is recommended that this dataset is used in conjunction with the guidelines developed by Barrell et al. (2015).The NZAFD is produced by GNS Science and represents the most current mapping of active faults for New Zealand in a single database. The NZAFD can be accessed on the GNS webmap via the link below.The NZAFD contains two distinct datasets based on scale:The high-resolution (NZAFD-HighRes) dataset (1:10,000 scale or better), designed for portrayal and use at cadastral (property) scale. This is currently only available to be viewed on the GNS webmap for some regions.The generalised (NZAFD-AF250) dataset, designed for portrayal and use at regional scale (1:250,000 scale). This can be viewed and downloaded on the GNS webmap for the entire country.Both datasets comprise polylines that represent the location of an active fault trace at or near the surface, at different scales. Each fault trace has attributes that describe its name, sense of movement, displacement, recurrence interval and other parameters.The high-resolution dataset group on the GNS webmap also includes two polygon layers derived from the NZAFD:Fault Avoidance Zones, which delineate areas of surface rupture hazard, as defined by the Ministry for the Environment Active Fault Guidelines (Kerr et al. 2003(external link)), or modifications thereof.Fault Awareness Areas, which highlight areas where a surface rupture hazard may exist (Barrell et al. 2015(external link)) and where more work is needed.