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This raster shows estimated wave arrival times for a maximum-considered distant tsunami (AKmax) caused by a magnitude 9.2 earthquake below the Gulf of Alaska.
Oregon Department of Geology and Mineral Industries
Estimated wave arrival times (in minutes) for a maximum-considered distant tsunami (AKmax) caused by a magnitude 9.2 earthquake below the Gulf of Alaska.
Wave arrival for XXL and AKmax are determined at ~20 million nodes covering the Oregon Coast using time history data from the tsunami model used to create Oregon’s current evacuation maps, evacuation zones, and inundation maps. The tsunami wave arrival time was defined as that point in time when the simulated tsunami water level exceeds the background MHHW level by 6 inches (15.2 cm).
The purpose of this data is to provide statewide tsunami wave arrival maps for a maximum-considered local (Cascadia Subduction Zone) and distant (Gulf of Alaska) tsunami that will impact the Oregon Coast. These data may then be integrated into an online map viewer (e.g. the NANOOS tsunami evacuation web portal) for access by the public. We hope to further educate the public on differences between distant and local tsunami events, especially the time available to evacuate from each. Furthermore, knowing when tsunamis will arrive along the Oregon coast is important for evacuation planning, enabling communities to evaluate mitigation options such as route improvements and/or vertical evacuation.
Publication
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REPORT DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. See the accompanying text report for more details on the limitations of the methods and data used to prepare this publication.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
This project was funded by the National Oceanic and Atmospheric Administration (NOAA) through the National Tsunami Hazard Mitigation Program under award #NA17NWS4670013 and #NA18NWS4670076.
Raster values were checked (cellsize and raster statistics including min, max and mean) using automated QAQC tools designed specifically for tsunami data. Raster values were also reviewed visually in ArcGIS.
Raster values were checked (cellsize and raster statistics including min, max and mean) using automated QAQC tools designed specifically for tsunami data. Raster values were also reviewed visually in ArcGIS.
The Oregon Coast, from Columbia River to California border. Seaward extent of raster is clipped to the the limit of the corresponding 2011 inundation zone.
Raster derived from unstructured grid nodes with average spacing of 5-7 meters on land. Interpolated using Natural Neighbor with a cell size of 20 feet (X and Y).
Wave arrivals at individual nodes are calculated in Matlab using time history data from the 2011 tsunami modeling, which is described in Witter et al, 2011. Time history data is not published due to its large size, however Priest et al, 2013a-g (see report for this full reference list) provide a list of nodes with several attributes for each section of coast. Using Esri ArcGIS 10.7 and Esri ArcPro 2.6 software the raster was derived from unstructured grid nodes with average spacing of ~5-7 meters (~16-23 ft). Interpolated using Natural Neighbor with a cell size of 20 feet (X and Y). See the text from this open-file report for technical information on mapping methods.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org
Although these data have been processed successfully on a computer system at the Oregon Department of Geology and Mineral Industries, no warranty expressed or implied is made by DOGAMI regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty.
When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org