The previous record for "loudest crowd roar at a sports stadium," was 131.76 decibels, set in 2011 in Turkey at the Ali Sami Yen Sport Complex Turk Telekom Arena during a soccer match between Galatasaray SC and Fenerbahce.
The reading was confirmed by Phil Robertson, a judge for Guinness, the Seattle Times reported. The newspaper said the stadium's crowd noise got even louder during a third-quarter goal-line stand by Seattle defense reaching 136.6 decibels, according to Bill Stewart, the sound engineer and partner at SSA Acoustics in Seattle who did the measuring.
Volume 12 footed the bill for the Guinness World Records official to come to Seattle and wasn't affiliated with the team.
The Associated Press contributed to this story.