Hello how may I help you? What was the loudest recorded sound? The loudest recorded sound was the eruption of the Krakatoa Volcano in Indonesia What were the decibels? It was 220 decibels. It could be heard 3000 mi away wow. What seconds that? The Tunguska Meteor. Wow. How loud by decibels? that was 218 decibels. it was a loud explosion Wow. Cool Have a great day!