The impact of 63.5 million cubic meters of rock hitting the fjord released forces large enough to be registered globally. The seismic waves that cascaded across the planet were recorded by sensor stations worldwide and were equivalent in energy to a magnitude 5.4 earthquake. The sloshing water within the fjord established a 66-second long-period seiche, a standing wave, that reverberated back and forth for 36 hours.
“It could easily turn into a catastrophic disaster,” Fathian says. It could, because Tracy Arm is a highly frequented tourist destination.
A close call
During the summer, more than 20 boats navigate the Tracy and Endicott arms every day, including up to six
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