2018 Tsunami Design Zone Maps
Maps currently adopted for this purpose are:
|Tsunami hazard maps used for the 2018 tsunami design zone maps|
|Anacortes and Bellingham area||MS 2018-02*||Download|
|Elliott Bay Seattle||OFR 2003-14||Download|
|Everett area||OFR 2014-03||Download|
|Port Angeles and Port Townsend area||MS 2018-03||Download|
|San Juan Islands||MS 2016-01*||Download|
|Southern Washington coast||MS 2018-01||Download|
|Tacoma area||OFR 2009-9||Download|
*These publications have been partly or fully superseded by the 2021 Puget Sound publication, MS 2021-01. The 2018 tsunami design zone maps used these older publications, but the 2023 tsunami design maps will use the latest publications.
The above list will be updated for the 2023 building code and future building codes. Future building codes will include the latest publications or updates on a schedule corresponding with the updates and adoption of the Washington State Building Code.
Please note that inundation depth values quoted in both the source publications and the raw data available from WA DNR are set to a mean high water (MHW) tidal datum. As this is higher than the standard North American Vertical Datum of 1988 (NAVD 88) used in the IBC, the values listed in the WA DNR data will need to be recalculated according to the differences between NAVD 88 and MHW at the project site. This recalculation to NAVD88 has already been conducted for the data displayed in the pop-up on this page. The published maps, model data, and results shown here already incorporate ground deformation (subsidence) from the earthquake in the inundation depth/elevation results. The published maps, model data, and results shown here do not include any contribution from sea level rise. Local sea level rise projections for Washington State are available here: Miller and others, 2018.
We recommend users of this webpage use the search tool in the webmap to jump to their project site or zoom in to an area of interest. While viewable at all scales, the identify pop-up is best used when zoomed in, or else you may accidentally select numerous adjacent data.
The Washington Geological Survey (WGS) shall not be held liable for improper or incorrect use of the data described and (or) contained herein. This product is provided 'as is' without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular use. The Washington State Department of Natural Resources and the authors of this product will not be liable to the user of this product for any activity involving the product with respect to the following: (a) lost profits, lost savings, or any other consequential damages; (b) the fitness of the product for a particular purpose; or (c) use of the product or results obtained from use of the product. Although these data have been processed successfully on computers of WGS, no warranty, expressed or implied, is made by WGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
For more information about this page and the tsunami inundation data please contact:
Chief Hazards Geologist