Midway through the third quarter, during a goal-line stand that stopped the 49ers, the noise reached 136.6 decibels, said Bill Stewart, the sound engineer and partner at SSA Acoustics in Seattle who did the measuring. Robertson said he could feel a clipboard vibrate in his hand.
The previous record was 131.76 decibels, set on March 18, 2011, during a soccer match in Turkey.
Aaron Levine ?@AaronQ13Fox 7m
The #12thMan has set World Record for Crowd Roar at 131.9 decibels!! Came after Michael Bennett's sack!! #Seahawks #Niners @Volume12Seattle