Hawke's Bay Tsunami Evacuation Zones

1hr travel time away) used to define the orange evacuation zone, was a wave height modelled to 5 metres, determined from the GNS Science estimate of the wave height from distant source for likely to unlikely events. Supporting scenario for a 5m distant source event for HB (orange zone), is a M8.5 earthquake on the coast of Peru resulting in a 1,000 year return period wave, which has an offshore wave height of approximately 5m.Distant source events are assigned a MCDEM forecast threat-level, with threat levels (for tsunami height at the coast) ranging from 0.2-1m, 1-3m, 3-5m, 5-8m, to 8m+. On very rare occasions if wave heights are forecast higher than 5m for a distant source event then the yellow zone can also be evacuated.The orange zone is intended to be the area evacuated in most if not all distant and regional-source official warnings (i.e., warnings that extend beyond the red zone, for tsunami from sources more than one hour of travel time away from the mapped location). Local differentiation of this zone can be achieved using terms that are familiar to the community such as street names and key landmarks.Yellow ZoneThe probabilistic wave height with a 2500 year return period (i.e. maximum credible event) from all sources, based on the 2013 National Tsunami Hazard Model (Power, GNS Science Report 2013/131), is used to define the yellow evacuation zone. This zone must encompass all credible tsunami, including those for which there will only be enough time for natural or informal warning.The yellow zone should cover all maximum credible tsunami, including the highest impact events. The intention is that the yellow zone provides for local-source maximum credible events, based on locally determined risk. People should evacuate this zone in natural or informal warnings from a local source event. The yellow zone may be removed from published, publicly available evacuation maps in a region where the orange zone includes the local-source maximum credible tsunami. In this case it is very important that the boundaries of the orange zone are particularly cautious – that is, there should be negligible chance an official evacuation will be called that requires evacuation of an area larger than the mapped orange zone

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/8e867ba51a794c2d9cab9d4eb0b9c4b3_0
Created 2016-07-27T01:26:18.000Z
Date modified 2017-11-07T01:04:40.000Z
Efficiency Type
Dollars Saved
Jurisdiction New Zealand
Language English
Spatial {"type": "Polygon", "coordinates": [[[176.5106, -40.4306], [178.096, -40.4306], [178.096, -38.9169], [176.5106, -38.9169], [176.5106, -40.4306]]]}
Source Identifier http://opendata-hbrc.opendata.arcgis.com/datasets/8e867ba51a794c2d9cab9d4eb0b9c4b3_0
Record created November 8, 2017, Last Updated November 8, 2017