Fans were unanimous that the Foo Fighters rocked Auckland on Tuesday night - now geoscientists agree.
GeoNet data shows an eager crowd of 50,000 caused over three hours of sustained tremors during the Western Springs gig.
According to the geological hazard monitoring system the first vibrations were recorded part-way through supporting act Tenacious D at 7.30pm.
But the biggest shakes started when the Foo Fighters took the stage at 8.20pm, stopping only when the gig ended at 11pm.
According to a GeoNet blog the ground was shaking three times per second in a "nice rhythmic motion".
"There are lulls in the signal between the songs and peaks in signal intensity during the songs."
The blog says the shaking was equivalent to volcanic tremors that might be felt at Ruapehu or White Island.
The shakes were picked up by monitoring stations at nearby Herne Bay and Eden Park and the correlation in timing with the Foo Fighters set confirms the earth movement was all man-made.
The weight of approximately 50,000 fans is equal to around 5000 tonnes of mass moving on the ground.
The Foo Fighters aren't the first to shake the Auckland ground this year - in October's Rugby World Cup finals tremors were felt underneath Eden Park when the All Blacks defeated France in the nail-biting final.
- Auckland Now