Taylor Swift fans attending her concerts in Edinburgh, Scotland, for her massively popular Eras Tour danced so hard that they registered as seismic activity during each of her three shows.

The British Geological Survey (BGS) confirmed that earthquake readings could be detected up to 6 km (around 4 miles) away from Swift’s concerts last weekend at Murrayfield Stadium, per CBS News. 

The outlet noted that BGS said the most seismic activity occurred during Swift’s performance of three songs:  “…Ready For It?” “Cruel Summer” and “champagne problems.” 

“Dancing in time to the music and reached its peak at 160 beats per minute (bpm) during ‘…Ready For It?’, where the crowd was transmitting approximately 80 kW of power (equivalent to around 10 to16 car batteries),” the BGS noted. The loud bass in that song and the dancing generated the activity.

Scientists referred to the event as “ground shaking,” noting that Swift’s Friday night show caused the most seismic activity, delivering 23.4 nanometres (nm) of movement. The crowd and music on Saturday generated 22.8 nm, while it was 23.3 nm on Sunday.

The report noted that the fans attending the shows were likely the only ones to notice the shaking. 

This is not the first time seismic activity has been detected from a crowd. CBS noted that the same phenomenon happened at Swift’s stop in Seattle last summer. At the time, it was dubbed a “Swift Quake.”

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Seismologist Jackie Caplan-Auerbach told CNN at the time that the seismic activity was “equivalent [to] a 2.3 magnitude earthquake.”

“I grabbed the data from both nights of the concert and quickly noticed they were clearly the same pattern of signals,” Caplan-Auerback told the outlet. “If I overlay them on top of each other, they’re nearly identical.”

Ground shaking from large crowds of fans expressing enthusiasm is not limited to concerts. According to CBS, seismic activity occurred during a 2011 NFL playoff game at Qwest Field when the Seattle Seahawks hosted the New Orleans Saints. This was spurred by a huge fan reaction to a play made by Seahawks running back Marshawn Lynch. 

The resulting shaking earned Lynch the nickname “Beast Quake.”