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In partnership with the Alaska Earthquake Center and the Alaska Division of Homeland Security and Emergency Management, we publish maps of potential inundation made using numerical modeling of tsunami wave dynamics.
Actual conditions during a tsunami (e.g., style of earthquake, triggered landslides, on-land construction, tide level, local ground subsidence) may cause impacts that vary considerably from what is shown on the maps.
Tsunami inundation maps of Anchorage and upper Cook Inlet, Alaska. Authors: Suleimani, E.N., Salisbury, J.B., and Nicolsky, D.J. Publication Date: Aug 2023; Publisher: Alaska Division of Geological & Geophysical Surveys ; Ordering Info: Download below for free or see our publication sales page to order a hard copy. Quadrangle(s): Anchorage
16 Αυγ 2023 · Associated coastal currents could be several knots faster than normal tidal currents and could persist for up to 72 hours. For decades, public perception has been that upper Cook Inlet, including Alaska’s biggest city, Anchorage, has virtually no tsunami risk.
5 Οκτ 2020 · If the giant, slow-moving landslide were to suddenly collapse into the narrow fjord below, it would generate an extremely large tsunami because of the way the fjord's shape would amplify the wave.
In addition to increasing the accuracy of tsunami hazards assessments along the Alaska-Aleutian subduction zone, the findings highlight an important discovery: whether a subduction megathrust is locked or creeping today may not necessarily reflect its potential to generate large tsunamis.
A large steep slope in the Barry Arm fjord 30 miles (50 kilometers) northeast of Whittier, Alaska has the potential to fall into the water and generate a tsunami that could have devastating local effects on those who live, work, and recreate in and around Whittier and in northern Prince William Sound.
