FLORHAM PARK, N.J. — The ground shook, literally, after Seahawks running back Marshawn Lynch galloped to a must-be-seen-to-be-believed 67-yard touchdown that sealed Seattle’s wild-card win over the Saints in 2011.

A video shot by a fan in the upper deck of CenturyLink Field (then called Qwest Field) was posted on YouTube and caught the eye of John Vidale, the director of the Pacific Northwest Seismic Network. Vidale checked the seismic readings from a monitoring station located just west of the stadium.

Vidale confirmed what might seem unbelievable: the 66,336 fans cheered so loudly that they created a minor earthquake.

“I think that’s pretty much at the upper limit of what 50,000 people in a stadium can do,” said Vidale, who has measured other moments of seismic activity on football Sundays over the years.