Hello how may I help you? whats the loudest sound? The loudest sound ever made was by the Krakatoa volcanic eruption. It was so loud it ruptured eardrums of people 40 miles away. Would you like to know anything else? how loud was it?> The explosion registered in at 172 decibles 100 miles from the source. ohh wow Is there anything else you would like to know about? nothing\ Great, if you have any more questions don't be afraid to ask! sure thanks No problem, have a great day.