Over the past decade, landslides have been responsible for generating giant waves in Alaska and Greenland.
Such a tsunami could have a significant impact on areas frequented by potentially hundreds of people at any one time—including tourists, fishermen, hunters and local residents—the scientists said in an open letter published on the website of the Alaska Department of Natural Resources, Division of Geological and Geophysical Survey
"Alaska parks are prone to events like this. Land-slides that generate large tsunamis most often happen in landscapes with retreating glaciers.
In their research, the scientists analyzed photographs and measurements of elevation that were collected previously by satellites and aircraft. This revealed that portions of the slope had moved 600 feet downhill between 2009 and 2015. Furthermore, preliminary analysis of radar satellite data from 2019 indicated that some sections are still moving, albeit at a slower rate than during the aforementioned period.
The researchers say that the landslide could result in only a partial or gradual collapse, in which case the tsunami would be less severe, with the effects mainly felt within Barry Arm and Harriman Fiord. "In other words, we believe these initial results are sufficiently detailed to support initial assessment of the hazard faced in Prince William Sound."
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