Hello how may I help you? I want to know what the loudest recorded sound was. The loudest sound was made by the Krakatoa volcanic eruption in 1883. Would you like to hear more? Yes, how loud was the sound made from that volcanic eruption? The Krakatoa eruption was registered as 172 decibels at 100 miles from the source. Oh that's very loud than what I'm used to. Yes, the human threshold for pain is near 130 decibels. It would have been a painful explosion to hear. That's very good information to hear. Thank you. Is there anything else you would like to know about the loudest sound recorded? Not at this time, thanks for helping Anytime! Just ask.