That rumbling underfoot you felt on September 3 has now been identified. It seems the home crowd watching their Virginia Tech Hokies take the field with Metallica's "Enter Sandman" blasting made so much of a ruckus that it registered on instruments designed to detect earthquakes.
During the song's slow build, the crowd at Virginia Polytechnic Institute and State University's 65K+ Lane Stadium was already on their feet causing some movement on the planet's crust. Once the grinding chords of Metallica's "Enter Sandman" begin, and the team makes their way to the gridiron, the stadium erupted with a welcoming ovation that registered on a seismograph.
The team has historically used the band's classic, self-titled 1991 album opener as their entrance music, beginning in 2000, led by the school's Marching Virginians. VT's opposition for the day, the UNC Tarheels, were visibly "off to never-never land" while all the jumping in place, known as the "Blacksburg Bounce," was going down. The final score was 17-10 in favor of VT. Poor Tarheels.