A FOO Fighters concert at an outdoor stadium in Auckland has added a twist to New Zealand's reputation as the Shaky Isles.

The rumble caused by 50,000 dancing fans created ground movements similar to volcanic tremors.

The tremors from Tuesday night's concert were picked up on seismic monitors 1.5km and 2km from Western Springs stadium, according to New Zealand's seismic monitoring service GeoNet.

GeoNet said the first vibrations were recorded around 7.30pm, during support band Tenacious D's set.

But it was when the Foo Fighters took the stage at 8.20pm that the biggest shakes began.

GeoNet said the weight of the fans was equivalent to about 5000 tonnes of mass moving on the earth's surface.

GeoNet's recordings show lulls between songs and peaks in intensity during the songs.



At its peak, the ground was shaking three times per second in a rhythmic motion.
When the concert ended at 11pm, the vibrations stopped.

The signal recorded on Tuesday night is similar to tremors recorded at two active volcanos in the North Island, Mt Ruapehu and White Island.

GeoNet's instruments also picked up ground vibrations during the Rugby World Cup final.