Regional tsunami hazard assessment for the communities of Port Alexander, Craig, and Ketchikan, Southeast Alaska

Description

We assess potential tsunami hazards for coastal communities in Southeast Alaska: Port Alexander, Craig, Saxon, Mountain Point, and Ketchikan. The primary tsunami hazard for these communities is considered to be far-field, with the major threat originating from tsunamigenic earthquakes along the Alaska-Aleutian subduction zone across the Gulf of Alaska. We numerically model tsunami waves generated by four different megathrust earthquakes and develop approximate tsunami hazard maps for the three communities. The hypothetical tsunami scenarios that we examined include variations of an extended 1964 rupture, megathrust earthquakes in the Prince William Sound and the Alaska Peninsula regions, and a Cascadia megathrust earthquake. The maximum runup heights are 4 m (13.1 ft) in Port Alexander, 3.2 m (10.5 ft) in Craig, and 1 m (3.3 ft) in Ketchikan. 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/10.14509/30196.

Resources

Name Format Description Link
0 http://doi.org/10.14509/29741
0 CSDGM IMPORT ERROR: No digtinfo/formcont http://doi.org/10.14509/30196
0 http://doi.org/10.14509/30196
0 http://doi.org/10.14509/30029
0 http://doi.org/10.14509/26671
0 http://doi.org/10.14509/29577
0 http://doi.org/10.14509/29404

Tags

  • craig
  • coastal and river
  • engineering
  • refuge cove state recreation site
  • seismic hazards
  • inundation
  • clam cove
  • tectonics
  • bucareli bay
  • ward cove
  • mountain point
  • marine geology
  • modeling
  • bathymetry
  • herring cove
  • behm canal
  • faults
  • holocene
  • geologic
  • vallenar bay
  • george inlet
  • engineering geology
  • geology
  • east island
  • coastal
  • knudson cove
  • chichagof mining district
  • totem bight state historical park
  • radenbough cove
  • faulting
  • clarence strait
  • earthquake
  • ketchikan
  • flood
  • whisky cove
  • pennock island
  • shelter cove
  • fault displacement
  • southeast alaska
  • craig island
  • refuge cove
  • geotechnical
  • port alexander
  • bald headed cove
  • neotectonics
  • chatham strait
  • tongass narrows
  • herring bay
  • geological process
  • active fault
  • port higgins
  • hazards
  • saxman
  • emergency preparedness
  • crab bay
  • surface
  • pacific ocean
  • mud bay
  • tsunami
  • geologic hazards
  • tides
  • ship cove

Topics

  • Local Government

Categories