Name: Tsunami Evacuation Zones

Display Field: Tsunami_Region

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Description: The Oregon Department of Geology and Mineral Industries (DOGAMI) maintains the most up-to-date tsunami inundation information for the state of Oregon. This layer reflects a compilation based on both original (2013) tsunami modeling as well as more recent modeling updates. Beginning in 2013, DOGAMI began publishing the next generation of tsunami evacuation maps for the coast of Oregon. Since then, specific areas of the Oregon coast have been updated with newer studies. Additional detailed information about the tsunami modeling may be found in Priest and others (2013) (https://www.oregongeology.org/pubs/ofr/p-O-13-13.htm). This polygon feature class shows the tsunami evacuation region. Definitions of each of the four different regions are provided below: 1) Distant Tsunami Evacuation Zone = simulated for a maximum-considered eastern-Aleutian Island earthquake termed AKmax; 2) Local Tsunami Evacuation Zone = The local tsunami evacuation zone is based on a maximum-considered Cascadia Subduction Zone earthquake termed XXL1. Note, in this event, the distant zone plus the local evacuation zone reflects the entire extent of the local tsunami zone; 3) Outside Hazard Area = The outside tsunami hazard zone extends landward of the local tsunami evacuation zone and is considered to be safe from the effects of a Cascadia tsunami; 4) OPTIONAL - Outside Hazard Area = An optional area of high ground that is outside the L1 tsunami hazard zone was developed for the community of Gearhart in Clatsop County, due to the large evacuation distances needed to reach high ground associated with a maximum considered XXL1 tsunami. The two tsunami event sizes included in this layer are 1) Event reflects a maximum-considered distant tsunami event originating from the Eastern Aleutian Islands (AKmax), and 2) the Extra-extra-large1 (XXL1) tsunami scenario, which is a Local Cascadia Subduction Zone (CSZ) tsunami scenario generated by a magnitude 9.1 earthquake. The XXL1 event has an estimated recurrence rate of >5,000 years. This layer was published in 2022 by the Oregon Department of Geology and Mineral Industries as part of the Oregon Statewide Tsunami Geodatabase Compilation 1.0 (OGTC-1). DOGAMI Website: http://www.oregongeology.org/ DOGAMI Contact: dogami-info@oregon.gov Horizontal Positional Accuracy: Tsunami simulations use unstructured computational grids constructed from detailed bathymetric and topographic data, particularly lidar. Spacing between computational grid points, a measure of the precision of this data, is generally less than 10 m in populated areas and at critical shoreline features such as jetties. Vertical Positional Accuracy: Values were derived from tsunami modeling using an unstructured grid and the hydrodynamic model SELFE (Semi-implicit Eulerian-Lagrangian Finite Element model, Zhang and Baptista, 2008). SELFE passed all standard tsunami benchmark tests (Zhang and Baptista, 2008a) and closely reproduced observed inundation and flow depths of the 1964 Alaska tsunami in a trial at Cannon Beach (Zhang et al, 2011). Thirteen computational grids were developed as part of the original coastwide modeling. These grids were constructed by first compiling digital elevation models (DEMs) covering five different model regions of the Oregon coast and then retrieving from the DEM elevations at a series of points defining a triangular irregular network (TIN). The DEM for the regional simulations was compiled from ETOPO1 1-arc-minute (~1.9 km (1.2 mi)) database (http://www.ngdc.noaa.gov/mgg/global/global.html) and 1/3-arc-second (~10 m (33 ft)) tsunami grids obtained for each region (Astoria, Garibaldi, Central and Port Orford) and obtained from the National Center for Environment Information (NCEI, formerly National Geophysical Data Center), supplemented in areas of dry land by 2008-2009 lidar (light detection and ranging) data. Additional bathymetric data were obtained from the US Army Corps of Engineers for all navigational channels spanning Oregon estuaries. All data sets were adjusted to the North American Vertical Datum of 1988 (NAVD 88) and WGS 84 map projection. Vertical accuracy is therefore a function of many different factors, including the DEM, model physics, friction factors, and tidal stage.

Copyright Text: Tsunami mapping and modeling was funded by the National Weather Service of NOAA through the National Tsunami Hazard Mitigation Program. GIS data assimilation and visualization was funded by the Oregon GeospatialEnterprise Office.

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• Value: Distant Tsunami Evacuation Zone
  Label: AKmax Distant Tsunami Evacuation Zone
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• Value: Local Tsunami Evacuation Zone
  Label: XXL1 Local Tsunami Evacuation Zone
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• Value: OPTIONAL - Outside Hazard Area
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• Value: Outside Hazard Area
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