The Loudest Sound Ever Heard Krakatoa exploded on August 27, 1883. Sailors 40 miles away had their eardrums burst. The bang was clearly heard 3,000 miles away on Rodrigues Island. Barometers around the world twitched for five days as the pressure wave circled Earth seven times.
Source
Smithsonian Magazine, 2013, 'Krakatoa: The Loudest Sound' / Simon Winchester's 'Krakatoa: The Day the World Exploded' (2003)
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