The scale of the geological event is like something from prehistoric times, with a tsunami 200 meters--656 feet--in height. But it happened last year. Researchers warn that similar events may reoccur.
Images taken from Dickson fjord show before and after photos of the mountain peak and glacier where a large landslide triggered a tsunami.
“The signal we describe is more like striking a single piano key for a very pure tone lasting for nine days.” The tsunami in question was towering: 200 meters -- 656 feet -- in height, according to the researchers. Because the wave’s energy was trapped in a rocky fjord, the water sloshed back and forth in a phenomenon called a seiche -- and the scientists traced the seismic signal that was detected on sensors from the Arctic to Antarctica to that pattern.
“Only when we had access to declassified army bathymetrical mapping and had tweaked our tsunami models could we prove it through modelling: that part of the tsunami got caught between the parallel sides of the fjord and resonated for nine days,” he says.
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