Landslides – Tsunami Hazards in Coastal Alaska

July marks the anniversary of Alaska’s most famous landslide, Lituya Bay (1958), which generated a devastating tsunami. A large number of landslides that also triggered tsunamis in Alaska’s documented history occurred between July and October, when steep coastal slopes are particularly vulnerable to failure. It’s also when most people are out enjoying Alaska’s amazing coastal resources, and knowing this potential double threat is essential to keeping people safe.

The Alaska Earthquake Center has produced an interactive ArcGIS StoryMap to describe what we know about large coastal landslides in Alaska, and ongoing efforts to monitor unstable slopes. Since 2023, the Seismic Center has continuously monitored large landslides using its statewide seismic network, with coverage extending from Denali National Park across much of the Alaskan coast. Rapid awareness of slope failure can help Alaska’s coastal communities prepare for the possibility of a tsunami in its wake.

We partner with a variety of federal, state, and local organizations aimed at mitigating and rapidly responding to landslide and tsunami risks. Each agency plays a different role. For example, the USGS does a lot of remote sensing, analyzing satellite images and aerial photographs to document constant and rapid slope movements. The Alaska Department of Geological and Geophysical Surveys plays an integral role in hazard analysis and aerial surveys, and recently published a comprehensive map of areas prone to deep landslides.

These efforts and more are captured in the interactive multimedia StoryMap here.

Additional resources

The argument in favor of a landslide monitoring programme

A large landslide in the Southeast Alaska Fjord

What it takes to catch a landslide in Alaska

A new detection method aims to warn of the occurrence of tsunami landslides

Waiting for Failure (Tracy Arm Landslide StoryMap)

Susceptibility to Deep Landslides in Alaska (DGGS)

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