Korean skyscraper shakes from 17 middleaged people doing Tae Bo

first_imgEarlier this month, TechnoMart, a 39-story skyscraper in Seoul, South Korea was evacuated after its occupants felt the building shake for about 10 minutes. However, there was no seismic activity at the time of the tremors, which left many scientists puzzled for the past two weeks. So, what caused the building to shake so much? Apparently, it was a group of 17 middle-aged people doing Tae Bo.The group of people doing Tae Bo, which is a mixture of aerobics and Taekwondo made popular by fitness instructor Billy Blanks, caused the top floors to feel the tremors while listening to Snap’s “The Power,” a huge hit from 1990.Scientists later recreated the event (which makes us chuckle as we imagine lab-coat wearing scientists doing Tae Bo) and found the same result. The gym is on the 12th floor, and Chung Lan, a professor of architectural engineering at Dankook University, said that the “vibration cycle caused by Tae Bo collided with the vertical vibration cycle unique to the building.”Lee Dong-guen, an architectural professor at Sungkyunkwan University who helped conduct the experiment, said that the upper floors of the building vibrated at ten times the normal level while the scientists were doing upper-cuts and roundhouse kicks. This is apparently a phenomenon called resonance, which always results in a large vibration. The scientists are still examining the issue further, but are confident that the shaking came from the Tae Bo workoutTechnoMart gets about 50,000 visitors daily but was closed for two days after the incident. The building itself is said to be structurally sound, so it seems the only thing necessary is a sign on the gym that says “No Tae Bo.”via CNN and Wall Street Journal Korealast_img

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