（24-25高三下·安徽安庆·期中）Taylor Swift fans really know how to “Shake It Off” — and shake the ground. Scientists studied how the stadium and ground trembled during one of Swift’s Eras Tour concerts last August. They discovered that dancing fans generated shaking in the ground — earthquake waves that matched the beat of each song. During Swift’s performance of “Shake It Off”, the stands released about as much energy as a magnitude 0.85 earthquake, which is not quite strong enough to be felt by humans.
This isn’t the first time scientists have measured quakes from a stadium. In 2011, Seattle Seahawks fans shook their home stadium with cheers after a stunning touchdown. And last July, Swifties rocked the ground at a Seattle concert. The shaking from those events differs from an earthquake. Earthquakes usually last only a few seconds. A “concert quake” can last several minutes. Besides, the ground also moves in different ways during quakes and concerts. Earthquakes happen when big tectonic (地壳的) plates move around. Those motions perpetually change the ground. In contrast, the shaking caused by crowds “is more like splashing (泼水) in a pool,” explains Gabrielle Tepp, a professor at the California Institute of Technology in Pasadena. “You see the waves coming out, but then once you’re done splashing, it just goes back to normal.” The “concert quake” doesn’t usually deform the Earth.
Tepp and her colleagues used similar instruments to detect earthquakes and concert quakes. In the new study, they set up a portable speaker next to a motion sensor in their lab and turned the speaker volume all the way up. They also played Swift’s “Love Story” at the speakers’ highest volume. Tepp even jumped around near the sensor while dancing to the last chorus. The sensor picked up the quaking which matched that from the concert only when Tepp was jumping around, which suggests that the shaking measured at the concert came from fans jumping and dancing, too.
The findings tell scientists about more than just concert shaking. Understanding how a stadium quakes in response to a large crowd could help make buildings safer, says Golos. “We can also better understand human behavior using such seismic data”, she says. “I think there’s a lot of interesting information hidden in there.”
260．What is the function of the first paragraph?
A．To introduce the main argument.
B．To provide background information.
C．To offer a convincing explanation.
D．To conclude the previous findings.
261．What does the underlined word “perpetually” mean in paragraph 2?
A．randomly. B．slightly. C．permanently. D．regularly.
262．Why did Tepp and her colleagues conduct the experiment?
A．To test the effectiveness of the motion sensor.
B．To figure out the quake source of the concert.
C．To prove that Taylor Swift’s songs can cause ground-shaking.
D．To study the relationship between music volume and ground-shaking.
263．What’s the significance of the research?
A．It guides fans to behave well at a concert.
B．It predicts when and where an earthquake will happen.
C．It improves stage design and sound effect of a concert.
D．It lays a foundation for creating safer architecture.
【答案】260．B 261．C 262．B 263．D
【知识点】科普知识 、说明文
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