The loudest sound in recorded history came from the volcanic eruption on the Indonesian island Krakatoa at 10.02 a.m. on August 27, 1883. The explosion caused two thirds of the island to collapse and formed tsunami waves as high as 46 m (151 ft) rocking ships as far away as South Africa.

The loudest sound ever recorded in history was the volcanic eruption of Krakatoa in Indonesia on August 27, 1883. This massive explosion generated a sound wave so powerful that it was heard as far as 3,000 miles (4,800 km) away, where people compared it to the sound of cannon fire from a nearby ship. At its epicentre, the sound reached an estimated 310 decibels (dB)—far beyond the 194 dB limit where sound waves transition into pure shockwaves. A grounded reality check: even at 100 miles away, the sound was measured at 172 dB, loud enough to permanently rupture eardrums. The pressure wave from the blast was so high-fidelity that it circled the entire globe seven times and was detected by barometers worldwide for five days. For a 2026 comparison, the loudest man-made sound was the Tsar Bomba nuclear test at 224 dB, but even that gargantuan blast pales in comparison to the supportive but terrifying power of nature's "Gold Standard" volume event at Krakatoa.