Kodiak Tsunami Inundation Mapping

The full version of the report and tsunami hazard maps that we have prepared for the Kodiak area is the downloadable DGGS Report of Investigations 2002-1. Two 1:12,500-scale maps show inundation lines calculated for seven different tsunami scenarios, one map for the city of Kodiak and the other for US Coast Guard Reservation and Womens Bay. Two corresponding maps show the estimated extent of inundation in the same communities resulting from the "worst case scenario", which is the maximum inundation of all modeled scenarios as well as areas of observed 1964 tsunami effects that extended farther inland than all of the modeled inundations.

The Kodiak area was identified as a high-priority region for Alaska inundation mapping. Kodiak's vulnerability to tsunamis was demonstrated by the 27 March 1964 earthquake (moment magnitude 9.2). In the city of Kodiak, the tsunami caused 6 fatalities and about $30 million in damage. Since then, the harbor and waterfront area of the city that was destroyed by the 1964 tsunami has been rebuilt and significantly expanded, and substantial additional growth of the city of Kodiak and other nearby communities has occurred.

The preferred sites for runup modeling were determined by ADHS&EM and Kodiak local government officials to be the three communities of metropolitan Kodiak: the city of Kodiak, U.S. Coast Guard Reservation, and Womens Bay. Local and state emergency managers have requested maps showing the extent of inundation with respect to human and cultural features as a basis for preparing evacuation maps for these communities.

Damage at Kodiak from the March 27, 1964, tsunami. Photo credit: NOAA

Page created by E.Suleimani.
Updated: October 2006