What are ‘SwiftQuakes’ and which 5 Taylor Swift songs created biggest shockwaves?

nypost.com:

Gabrielle Tepp, author and amateur bass guitarist, said that the harmonics of the “concert tremor” that was recorded look a lot like those from volcanoes or trains, not quakes.

They were low frequency and not heard by the human ear. Large music festivals and stadium concerts produce similar vibration signals that resemble a harmonic tremor.The biggest bang came when Swift sang “Shake It Off.” The tremor was equivalent to about a magnitude 2 quake.

Instead of using magnitude, which is energy given off in a moment, scientists measured radiant energy, which is given off over time, for example, during a song.

Tepp dubbed it “song strength.”After conversions done based on an American Geophysical Union study, these are the the top five energy-releasing songs from Swift:“Keep in mind this energy was released over a few minutes compared to a second for an earthquake of that size,” Tepp said in a news release. “Based on the maximum strength of shaking, the strongest tremor was equivalent to a magnitude 2 earthquake.”She could identify 43 or 45 songs just by looking at the spectrograms – a graph of the strength of various signal frequencies overtime.