Foo Fighters rock Auckland - literally

02:39, Dec 15 2011
Foo Fighters Western Springs
Dave Grohl told the audience at Western Springs that These Days is his favourite song he's ever written.
Foo Fighters Western Springs
Fans braved the rain in Auckland to see the Foo Fighters at Western Springs.
Foo Fighters Western Springs
Jack Black from Tenacious D provided some comic moments on stage.
Foo Fighters Western Springs
Former Nirvana drummer Dave Grohl at Western Springs in Auckland.
Foo Fighters Western Springs
Dave Grohl plays to the crowd who braved the rain for the Auckland gig.
Foo Fighters Western Springs
The Foo Fighters played a massive set lasting for two hours and 45 minutes.
Foo Fighters Western Springs
Kyle Gass and Jack Black from Tenacious D.

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."

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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