Description
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.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| Web Resource | Unknown | Open resource | |
| Shapefiles and Raster data | Unknown | CSDGM IMPORT ERROR: No digtinfo/formcont | Open resource |
Tags
- active fault
- bathymetry
- bear creek
- blying sound
- box canyon creek
- caines head
- clear creek
- coastal
- coastal and river
- derby cove
- dggs
- earthquake
- earthquake related slope failure
- emergency preparedness
- engineering
- engineering geology
- fault displacement
- faulting
- faults
- first lake
- flood
- fourth of july creek
- geologic
- geological process
- geologic hazards
- geology
- geomorphology
- geotechnical
- hat island
- hazards
- humpy cove
- inundation
- landslide
- land subsidence
- likes creek
- lost creek
- lowell creek
- lowell point
- marine
- marine geology
- modeling
- neotectonics
- outreach
- preachers pond
- resurrection bay
- resurrection river
- salmon creek
- sawmill creek
- scheffler creek
- second lake
- seismic hazards
- seismic interpretation
- seismology
- seward
- slope instability
- spring creek
- spruce creek
- subsidence
- subsurface
- surface
- surface fault rupture
- surficial
- surficial geology
- tectonics
- thumb cove
- tonsina creek
- tonsina point
- tsunami