Sound experts recorded a peak noise of 115 decibels during Celtic’s 4-0 victory over Rangers.
The noise dwarfs levels recorded during a study of Premier League grounds in 2014, which found Old Trafford topping the list at a peak of 84 decibels.
The results, recorded by Vanguardia and issued by Hampden Park, found the peak noise came after each Celtic goal. The noise made by 49,729 fans when the teams came out of the tunnel hit 109 decibels.
A media release stated: “The peak level is equivalent to the roar of a real lion from less than a metre away, as loud as the front row of a music concert and just short of a jet engine at take-off from 25 metres.”
Matt McIlroy, senior acoustic consultant at Vanguardia, said: “The noise levels from the moment the players walked out on to the pitch were incredible and really shows the passion of the fans that those levels did not significantly change throughout the match.”
The Guinness Book of Records states that the loudest registered crowd roar at a sports stadium was 142.2 decibels by supporters of American Football side Kansas City Chiefs in 2014.