After two nights of earth-shaking dancing at Swift’s Seattle “Eras” tour concert at Lumen Field, enthusiastic Swifties caused seismic activity equivalent of a 2.3 magnitude earthquake, according to seismologist Jackie Caplan-Auerbach.

The “Swift Quake” has been compared to the 2011 “Beast Quake,” when Seattle Seahawks fans erupted after an impressive touchdown by running back Marshawn “Beast Mode” Lynch. The ensuing celebration was detected on the same local seismometer as the Swift concert, Caplan-Auerbach told CNN.

Caplan-Auerbach, who works as a geology professor at Western Washington University, saw the comparison in a Pacific Northwest earthquake group she moderates on Facebook and immediately got to work.

Seismograms compare seismic activity from the 2011 'Beast Quake' with activity recorded during one of Taylor Swift's July concerts in Seattle.

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

The main difference between the July 22 and July 23 shows, aside from the surprise songs Swift is known to perform, makes up roughly 26 minutes. “I asked around and found out the Sunday show was delayed by about half an hour, so that adds up” Caplan-Auerbach said.

While the magnitude difference between “Beast Quake” and “Swift Quake” is only 0.3, Caplan-Auerbach said the Swifties have the Seahawks fans beat. “The shaking was twice as strong as ‘Beast Quake’. It absolutely doubled it.”

Overlapping seismograms from Taylor Swift's July 22 and July 23 'Eras' tour concerts.

“The primary difference is the duration of shaking,” Caplan-Auerbach explained. “Cheering after a touchdown lasts for a couple seconds, but eventually it dies down. It’s much more random than a concert. For Taylor Swift, I collected about 10 hours of data where rhythm controlled the behavior. The music, the speakers, the beat. All that energy can drive into the ground and shake it.”

While Caplan-Auerbach is excited about the chance of becoming a Swiftie herself, she is mostly driven by the opportunity to demystify science.

“What I love is to be able to share that this is science” she said, adding that “it doesn’t have to happen in a lab with a white coat. Everyday observations and experiences are science.”

CNN’s Chloe Melas, who attended one of Swift’s Seattle concerts, shared her observations and experiences as a concertgoer. “Going to Taylor’s concert in Seattle was unlike anything I’ve ever experienced,” she said. “You could literally feel the ground shaking beneath your feet. My ears are still ringing.”

Even Swift herself felt the energy from her West Coast Swifties, and thanked her Seattle audience in an Instagram post on Monday for “all the cheering, screaming, jumping, dancing, singing at the top of your lungs.”

“That was genuinely one of my favorite weekends ever,” she added.

Swift’s Seattle concerts come as she nears the end of the domestic run of her “Eras” tour, her first tour in five years. Along the way, the singer has been credited for boosting local economies and breaking an attendance record in Pittsburgh, among many other feats.

The “Eras” tour heads to Santa Clara in Northern California on Friday, and continues with six shows in Los Angeles next month to cap off her US tour run. Swift then goes international with “Eras,” beginning with a show in Mexico City on August 24.

Written by: Q1075

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