The Tonga earthquake was the largest explosion ever recorded, dwarfing nuclear explosions

They are energetic waves in the air that travel at the speed of sound and are able to maintain their shape along a path directed by the planet’s surface.

Scientists found that convective wave pulsations from the Tonga eruption were seen orbiting the Earth at least four times.

In Reading, England, more than 16,000 km from Tonga, pulses began arriving about 14 hours after the eruption of the Hong Tonga Hung Hapai volcano and immediately raised clouds.

“At the time, we had a laser cloud base recorder looking at the base of the cloud, and as the wave was going through the cloud it was turbulent,” Professor Giles Harrison, an atmospheric physicist at the University of Reading and co-author of one of the papers, told the BBC.

“If you wanted proof that the atmosphere is something remarkably interconnected, this was it. And what happens on one side of the planet can spread to the other side at the speed of sound.”

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When convection waves combined with ocean waves after a volcanic eruption, they caused tsunamis—not only in Tonga, New Zealand, and other parts of the Pacific Ocean, but in the Atlantic and Mediterranean as well.

People also heard the audible shock waves that were heard around New Zealand 10,000 kilometers away in Alaska.

The ultrasound signal was picked up by a global network of detectors set up to monitor compliance with the Comprehensive Nuclear Test Ban Treaty, which indicated that the explosion produced an atmospheric pressure wave similar to the largest nuclear explosion ever—the Tsar Bomba detonated by the Soviets in 1961—but it lasted four times.

New research remains to be done on the cause of the tsunami that struck the Tonga Islands in the immediate aftermath. Examination of the sea floor will determine how much, if any, part of the volcano’s collapse has contributed.

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