Updated tsunami inundation maps for Seward and northern Resurrection Bay, Alaska

Updated tsunami inundation maps for Seward and northern Resurrection Bay, Alaska, Report of Investigation 2022-3, updates the previous tsunami hazard assessment for Seward, Alaska by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquakes. We define an updated suite of earthquakes-including Tohoku-style megathrust ruptures and complex splay faulting in the upper North American plate from Kodiak Island and Prince William Sound-to calculate vertical seafloor displacements and model resulting tsunami dynamics in Resurrection Bay. A hypothetical earthquake with maximum slip distributed between depths of 0 and 18 km (11.2 mi) results in 'worst case' tsunami inundation for Seward. The maximum predicted overland flow depths in the community range from 10 to 25 m (33 to 82 ft), and the currents in community harbors could be as strong as 25 m/sec (48.6 knots). Dangerous wave activity is expected to last for at least 12 hours after the hypothetical worst-case earthquakes. 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 damage. This report updates the previous assessment of tsunami hazard for Seward published in 2010. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30893.

Data e Risorse

Campo Valore
access_constraints ["Use Constraints: 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)."]
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metadata_created 2025-09-23T22:20:30.995090
metadata_modified 2025-09-23T22:20:30.995096
notes Updated tsunami inundation maps for Seward and northern Resurrection Bay, Alaska, Report of Investigation 2022-3, updates the previous tsunami hazard assessment for Seward, Alaska by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquakes. We define an updated suite of earthquakes-including Tohoku-style megathrust ruptures and complex splay faulting in the upper North American plate from Kodiak Island and Prince William Sound-to calculate vertical seafloor displacements and model resulting tsunami dynamics in Resurrection Bay. A hypothetical earthquake with maximum slip distributed between depths of 0 and 18 km (11.2 mi) results in 'worst case' tsunami inundation for Seward. The maximum predicted overland flow depths in the community range from 10 to 25 m (33 to 82 ft), and the currents in community harbors could be as strong as 25 m/sec (48.6 knots). Dangerous wave activity is expected to last for at least 12 hours after the hypothetical worst-case earthquakes. 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 damage. This report updates the previous assessment of tsunami hazard for Seward published in 2010. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30893.
num_resources 4
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title Updated tsunami inundation maps for Seward and northern Resurrection Bay, Alaska