The risk of a tsunami hitting Anchorage – Alaska’s largest city, at the head of Cook Inlet – has been the subject of debate for years.
After several nearby earthquakes in the past decade, there’s been uncertainty around alerts warning residents that they are in danger. In the past, geologists have said the majority of Anchorage residents are safe from a tsunami, but there had never been a thorough study until the one released Wednesday, which includes detailed and updated inundation maps.
The study authors said in a press conference Wednesday that the potential tsunami impacts to the port are unclear and would require more research. About 75% of all water-bourne freight to Alaska enters the state through the Port of Alaska, in Anchorage. The report authors modeled Alaska’s magnitude 9.2 1964 Good Friday Earthquake – the second-largest earthquake ever recorded – and found that a 10-foot wave likely hit the city’s coastline more than eight hours after the earthquake. But that tsunami went undetected, the report says, because it came in the middle of the night and coincided with an outgoing tide, which lessened the tsunami’s effect.
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