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Layer: Tsunami Evacuation Zones (ID: 15)

Name: Tsunami Evacuation Zones

Display Field: Col_Code

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Wellington Region Tsunami Evacuation Zones. Tsunami evacuation maps containing three zones; red, orange and yellow, corresponding to different threat levels for the development of tsunami evacuation plans, public awareness, self evacuation and official civil defence emergency management or emergency services evacuations in the event of a tsunami. The zones were derived from two tsunami modelling projects. The first of these was a regional modelling project undertaken in 2008 using an empirical 'rule-based' tsunami height attenuation modelling technique. The second project was a more detailed hydrodynamic inundation modelling of Wellington Harbour undertaken in 2015. The red zone, also known as the shore exclusion zone, can encompass wave heights up to 1.2 m in height with a 1% annual exceedance probability (i.e. 100 yr return period) from all sources (local, regional and distant). The red zone is to be used when a tsunami forecast suggests a marine threat or a threat only to beaches and coastal infrastructure and facilities. The orange zone was defined using probabilistic wave heights with a 0.2% AEP (i.e. 500 yr return period) from regional (1-3 hr travel time away) and distant sources (>3 hr travel time away). For Wellington Harbour this encompasses tsunami waves heights up to 5.0 m. The orange zone is to be used when a forecast tsunami from a distant source is expected to cause some inundation, but not large enough to require evacuating the yellow zone. The yellow zone was defined using probabilistic wave heights with a 0.04% AEP (i.e. 2500 yr return period) from all possible sources and corresponds to the maximum credible event for the region and up to a 6000 yr return period for Wellington Harbour based on a Mw 9.0 earthquake on the Hikurangi Subduction Zone. The yellow zone is primarily for self-evacuation in the event of a strongly-felt or long-duration earthquake, or when a forecast of a distant-source tsunami of above a specific threat level is issued. Further information can be found in the reports:Leonard, G.S., Power, W., Lukovic, B., Smith, W., Johnston, D. and Downes, G. (2008), Tsunami Evacuation Zones for Wellington and Horizons Regions Defined by a GIS-Calculated Attenuation Rule. GNS Science Report 2008/30, 22 p. Mueller, C., Power, W.L. and Wang, X. (2015), Hydrodynamic Inundation Modelling and Delineation of Tsunami Evacuation Zones for Wellington Harbour. GNS Science Consultancy Report 2015/176, 30 p.

Copyright Text: GWRC, GNS

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