The volcanic eruption in Tonga this month unleashed an atmospheric shockwave that radiated out at close to the speed of sound, pushing large waves across the Pacific to the shores of Japan and Peru, thousands of kilometres away.
"We need to re-evaluate tsunami hazards for other volcanoes around the world," Fritz said.
Volcano-triggered tsunamis have been rare in modern history, and the shockwave from Tonga's volcano was among the largest ever recorded, similar to the one produced by the 1883 eruption of Krakatoa.that followed the eruption of Anak Krakatau, a tsunami set off by a volcano had not happened in the ocean in more than a century. Rather, 90 percent of tsunamis are triggered by earthquakes.
Seafloor instruments also monitor for irregular changes in wave height, sending information by surface buoy and then satellite to a warning centre for assessment.
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