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    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    Updated tsunami inundation maps for Homer and Seldovia, Alaska

    Metadata Updated: July 5, 2023

    We re-evaluate the potential tsunami hazard for the communities of Homer and Seldovia by numerically modeling the extent of inundation from tsunami waves generated by earthquakes and submarine landslides. Hypothetical worst-case scenarios are defined by analyzing the tsunami dynamics related to various plausible earthquake slip distributions along the Alaska-Aleutian megathrust. Potential tsunami sources include megathrust earthquakes in the Prince William Sound, Kenai Peninsula, and Kodiak Island regions. We consider scenarios similar to that of the 2011 Tohoku earthquake in Japan, with maximum slip located on a shallow portion of the plate interface close to the seafloor trench. We also consider local underwater slope failure scenarios for Kachemak Bay. The maximum predicted wave height from a tectonic tsunami is 10-12 m (33-40 ft) in Homer and 10-11 m (33-36 ft) in Seldovia, while the maximum landslide-generated tsunami may reach an elevation of up to 4 m (13 ft) on Homer Spit. In addition to Homer and Seldovia, we assessed the tsunami hazard for three small communities in Kachemak Bay: Seldovia Village, Jakolof Bay, and Kachemak Selo. Results presented here are intended to provide guidance to local emergency management agencies for tsunami inundation assessment, evacuation planning, and public education to mitigate future tsunami hazards. This report updates the previous assessment of tsunami hazard for Homer and Seldovia published in 2005. Version 2 provides expanded coverage of Seldovia shoreline. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30095.

    Access & Use Information

    Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

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    Dates

    Metadata Date October 17, 2019
    Metadata Created Date July 5, 2023
    Metadata Updated Date July 5, 2023
    Reference Date(s) January 1, 2019 (publication)
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from Alaska Division of Geological and Geophysical Surveys

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date October 17, 2019
    Metadata Created Date July 5, 2023
    Metadata Updated Date July 5, 2023
    Reference Date(s) January 1, 2019 (publication)
    Responsible Party Alaska Division of Geological & Geophysical Surveys (Point of Contact)
    Contact Email
    Guid 1796b79c-f652-413b-83c9-7380d246fdd7_source
    Access Constraints Use Constraints: This dataset includes results of numerical modeling of earthquake-generated tsunami waves for a specific community. Modeling was completed using the best information and tsunami modeling software available at the time of analysis. They are numerical solutions and, while they are believed to be accurate, their ultimate accuracy during an actual tsunami will depend on the specifics of earth deformations, on-land construction, tide level, and other parameters at the time of the tsunami. Actual areas of inundation may differ from areas shown in this dataset. Landslide tsunami sources may not be included in the modeling due to unknown potential impact of such events on a given community; please refer to accompanying report for more information on tsunami sources used for this study. The limits of inundation shown should only be used as a general guideline for emergency planning and response action in the event of a major tsunamigenic earthquake. These results are not intended for any other use, including land-use regulation or actuarial purposes. Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product., Access Constraints: This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
    Bbox East Long -151.424568
    Bbox North Lat 59.670972
    Bbox South Lat 59.387112
    Bbox West Long -151.780365
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id 1796b79c-f652-413b-83c9-7380d246fdd7
    Harvest Source Id 8f77b6d5-f630-4995-bdf3-0aee7158a7f3
    Harvest Source Title Alaska Division of Geological and Geophysical Surveys
    Licence The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.
    Lineage This lineage was generated by the FGDC CSDGM to 19139 transformation
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-151.780365, 59.387112], [-151.424568, 59.387112], [-151.424568, 59.670972], [-151.780365, 59.670972], [-151.780365, 59.387112]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 2013-01-01
    Temporal Extent End 2018-01-01

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