The vibrations emitted "a strong low signal," geologists at Auckland GeoNet reported. "The ground was shaking three times per second in a nice rhythmic motion." The recordings were taken at two monitoring stations located about a mile from the concert site at Western Springs.
With lulls between songs, and the biggest quake coming around the time the band took the stage at 8:20 p.m., it was clear the tremors were the man-made work of 50,000 dancing fans, the scientists concluded.
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