Tsunami inundation maps for Karluk and Larsen Bay, Kodiak Island, Alaska
Description
Tsunami inundation maps for Karluk and Larsen Bay, Kodiak Island, Alaska, Report of Investigation 2022-2, identifies potential tsunami hazards for the Kodiak Island communities of Karluk and Larsen Bay, Alaska, by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquakes. Credible worst-case scenarios are defined by analyzing the tsunami dynamics related to various plausible earthquake slip distributions along the Alaska-Aleutian megathrust. Potential worst-case tsunami sources include megathrust earthquakes in the Kodiak Island region with a magnitude range of Mw9.0 to Mw9.3. We do not include impacts of subaerial or submarine landslide tsunami sources, as that is beyond the scope of this study. A hypothetical earthquake near Kodiak Island with maximum slip distributed between 10 and 40 km depth (6.2-24.85 mi) results in 'worst case' tsunami-inundation for both Karluk and Larsen Bay. The maximum predicted overland flow depth ranges from 5 to 10 m (17 to 33 ft) in Karluk and from 10 to 15 m (33 to 49 ft) in Larsen Bay. The currents can be as strong as 4 m/sec (7.8 knots) in Karluk River and 7 m/sec (13.6 knots) in Larsen Bay. Dangerous wave activity is expected to last for at least 12 hours after the hypothetical worst-case earthquakes. Tsunami inundation maps that accompany this report represent a combination of numerous tsunami scenarios to show the maximum composite extent of inundation from these models. The 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. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30892.
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CSDGM IMPORT ERROR: No digtinfo/formcont |
https://doi.org/10.14509/30892 |
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https://doi.org/10.14509/30892 |
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https://doi.org/10.14509/29523 |
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https://doi.org/10.14509/30849 |
Tags
- topography
- coastal and river
- karluk river
- engineering
- seismic hazards
- land subsidence
- inundation
- karluk
- marine geology
- modeling
- uyak bay
- bathymetry
- faults
- cape karluk
- earthquake related slope failure
- geologic
- environmental
- engineering geology
- dggs
- coastal
- subsidence
- marine
- faulting
- earthquake
- larsen bay
- flood
- fault displacement
- kodiak island
- geotechnical
- neotectonics
- karluk lagoon
- tanglefoot bay
- subduction
- geological process
- shelikof strait
- active fault
- landslide
- hazards
- emergency preparedness
- surface
- geologic hazards
- seismic interpretation