An earthquake or Taylor Swift concert? Swifties redefine "shake it off"

Similar like Taylor Swift, her fan base seems to be catching on quickly.   

Researchers at Caltech and UCLA found that when thousands of Swifties let go during the pop star's historic "Eras Tour" last August at SoFi Stadium in Inglewood, California, they created activity equal to an earthquake.   

"It's been known that concerts produce these harmonic signals, but the exact cause hasn't always been understood," the study's lead seismologist Gabrielle Tepp of Caltech told The Los Angeles Times.  

. "This was one thing that we were kind of interested in seeing if we could really nail down what was causing it."  

The research, "Shake to the Beat: Investigating the Seismic Signals and Stadium Reaction of Events and Music Enthusiasts," focused on Swift's August 5 show, which 70,000 Swifties supposedly attended.  

After tracing the "seismic signature" of each song Swift performed, Tepp and colleagues discovered that "Shake It Off" had the "largest local magnitude of 0.851."   

However, what precisely was the reason for the earthquake activity? It was probably not SoFi's audio system, but rather the "dancing and jumping motions" of the singer's own fans.  

It turns out that these harmonic signals can be produced quite effectively by leaping.  

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