Layer: XXL1 Cascadia Local Source - Elevation (NAVD88, Feet) (ID: 51)

Parent Layer: Maximum Elevations, Flow Depths, and Currents

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Name: XXL1 Cascadia Local Source - Elevation (NAVD88, Feet)

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Description: Between 2010 and 2013, the Oregon Department of Geology and Mineral Industries completed modeling and mapping the next generation of tsunami evacuation maps for the coast of Oregon. Much of this source data was made available in a format that was difficult to work with and required significant processing steps to convert into a format that was easier to use. This project converted the original data into a more easily usable format and created useful derivative products. This layer is based entirely on the 2010-2013 modeling. 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 layer shows maximum elevations of the tsunami generated water level (over the course of the entire simulation), in feet, relative to the NAVD88 vertical datum. The XXL1 Cascadia Local Source tsunami is a maximum considered 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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