Nuclear-test monitor calls Tonga volcano blast "biggest thing that we've ever seen"

An infrasound station in Antarctica, designed to detect nuclear weapons tests. The Tonga eruption was so powerful that it was picked up on the remote continent.

The explosive volcanic eruption in Tonga on Saturday appears to dwarf the largest nuclear detonations ever conducted, according to a global group that monitors for atomic testing.

The shockwave from the blast was so powerful that it was detected as far away as Antarctica, says Ronan Le Bras, a geophysicist with the Comprehensive Nuclear-Test-Ban Treaty Organization in Vienna, Austria, which oversees an international network of remote monitoring stations.

In total, 52 detectors around planet Earth heard the low-frequency boom from the explosion as it travelled through the atmosphere. It was the loudest event the network had detected in more than 20 years of operation, according to Le Bras.