Published Dec 15, 2011We knew that the Foo Fighters rocked, but we had no idea that Dave Grohl and co.'s riff-heavy assault on the speakers could actually be measured tectonically. When the group performed a recent concert in New Zealand, they caused such a ruckus that the earth quite literally shook.
Two geological hazard monitoring stations picked up seismic waves when the band performed at Auckland's Western Springs Stadium on Tuesday (December 13). According to GeoNet's Shaken Not Stirred blog, the two stations were located 1.5 km and 2 km, respectively, away from the concert. The scientists found that the ground shook around three times per second and noted, "There are lulls in the signal between the songs and peaks in signal intensity during the songs."
So what exactly caused the shaking? It was "most likely the weight of the 50,000 fans dancing, as 50,000 fans is equal to around 5,000 tonnes of mass moving (or moshing) on the ground for the duration of the concert." The massive volume may have also contributed, "especially the bass frequencies coupling in to the earth."
There were even a few vibrations during Tenacious D's opening set. Come to think of it, that isn't that surprising. Have you seen The Pick of Destiny?