While thunder is one of the loudest natural sounds (a nearby thunderclap can reach 120 decibels), volcanic eruptions are even louder. Volcanic eruptions are over 272 decibels.
The eruption of the caldera volcano named Krakatoa (or Krakatau) on August 27, 1883 is the loudest natural sound in recorded history. The explosion was heard 4500 km (or 2796 miles) away and the sound covered 1/3 of the earth’s surface. The explosion was equal to approximately 21,000 atomic bombs.
Aside from these, the loudest sound that has ever occurred on this planet was most likely the sound of the meteorite hitting the Earth 65 million years ago.
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