Regional tsunami hazard assessment for selected communities on Kodiak Island, Alaska

Description

We assess potential tsunami hazard for the following seven coastal communities on Kodiak Island, Alaska: Akhiok, Chiniak, Karluk, Larsen Bay, Old Harbor, Ouzinkie, and Port Lions. The primary tsunami hazard for these communities is considered to be near-field, with a major threat originating from tsunamigenic earthquakes along the Alaska-Aleutian megathrust. We numerically model tsunamis generated by nine different megathrust earthquakes, analyze tsunami wave dynamics, and develop tsunami hazard maps for the seven communities. The hypothetical tsunami scenarios examined simulate Mw 9.0 megathrust earthquakes with a slip distribution in the 5-54 km (3-34 mi) depth range along the Alaska-Aleutian megathrust. The maximum runup heights are 14 m (46 ft) in Akhiok, 31 m (102 ft) in Chiniak, 11 m (36 ft) in Karluk, 18 m (59 ft) in Larsen Bay, 27 m (89 ft) in Old Harbor, 26 m (85 ft) in Ouzinkie, and 34 m (112 ft) in Port Lions. Results presented here are intended to provide guidance to local emergency management agencies in initial tsunami inundation assessment, evacuation planning, and public education for mitigation of future tsunami hazards. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30195.

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