How loud is the crowd at CenturyLink Field? So loud that a Marshawn Lynch 67-yard touchdown run for Seattle in the 2010 playoffs incited such a high level of cheering that a minor earthquake registered at local seismograph stations. So loud that in 2013 the fans set the Guinness World Record for crowd noise at an outdoor stadium (since broken by Kansas City Chiefs fans at Arrowhead Stadium) by measuring at 137.6 decibels. So loud that the sound is comparable to a jet airplane flying 100 feet overhead.
So loud that opposing quarterbacks tend not to think straight for days after playing there.