During Taylor Swift's recent concerts in Seattle, her passionate and devoted fans, lovingly referred to as "Swifties," surpassed all expectations by generating a minor earthquake with their energetic and earth-shaking dancing.

In the course of two exhilarating nights at Seattle's Lumen Field on July 22 and 24, where Taylor Swift enthralled her devoted fans, lovingly known as "Swifties," with her captivating performances as part of the "Eras" tour, their passionate and energetic dancing was so intense that it led to seismic activity being recorded, equivalent to a 2.3 magnitude earthquake; seismologist Jackie Caplan-Auerbach verified these seismic readings utilizing a local seismometer.

On that occasion, fans of the American Football team Seattle Seahawks erupted in response to an impressive touchdown by running back Marshawn “Beast Mode” Lynch.

Swift sold out both nights in Seattle, breaking the venue’s record of 70,000 people set by U2 in 2011. The Saturday show saw 72,171 “Swifties” in attendance.

Prof Caplan-Auerbach, a geologist at Western Washington University, said she saw the Swift comparison in a Pacific north-west earthquake group she moderates, so compared seismic data from both concerts and the 2011 NFL event.

“I grabbed the data from both nights of the concert and quickly noticed they were clearly the same pattern of signals,” she told CNN.

“The shaking was twice as strong as ‘Beast Quake’. It absolutely doubled it,” she said.

The Swifites’ ground-shaking dancing and cheering comprised around 10 hours of data, from both nights combined, with the massive energy generating the seismic activity.

“The music, the speakers, the beat. All that energy can drive into the ground and shake it,” Prof Caplan-Auerbach said.

Concerts do occasionally register seismic activity, such as a 2011 Foo Fighters gig in New Zealand, which was attended by 50,000 fans.

Swift herself appeared to thrive from the energy, thanking her Seattle crowd for “all the cheering, screaming, jumping, dancing, singing at the top of your lungs” in an Instagram post.

The “Eras” tour, Swift’s first in five years, is one of the most expensive ever, costing an estimated $100 million (£78 million) or more.