The Loudest Sound Ever Recorded Was Heard 3,000 Miles Away

In August 1883 (Review), the Earth produced a sound of almost unimaginable force. The cataclysmic eruption of the Krakatoa volcano in Indonesia was so violent that the resulting sound wave was not merely heard but felt. For those within a close radius, the effect was devastating; sailors on ships 40 miles away had their eardrums burst by the sheer acoustic pressure. Scientists estimate the sound registered 172 decibels even at a distance of 100 miles, a level far beyond the human pain threshold and capable of causing immediate, permanent damage.

The sound's journey, however, is what solidifies its place in history. It traveled across the Indian Ocean, with people on Rodrigues Island, nearly 3,000 miles from the volcano, reporting what they thought was the sound of distant cannon fire. This was not just a sound wave but a global atmospheric pressure event. Sensitive barometers around the world documented the pulse as it rippled through the air. Incredibly, this pressure wave was so powerful that it was tracked circling the entire planet three and a half times before it finally dissipated into the background noise of the atmosphere.