Matterhorn: full of vibrational energy

Matterhorn: full of vibrational energy

Stiff, still, motionless – these are the words most people use to describe a mountain. But Jeff Moore prefers the verbs “shuttering, shaking, and swaying.”

One Associate Professor Moore, a geology and geophysics major at the University of Utah, explained that geologists are taught to think about mountains over a long period of time, spanning the entire history of the Earth. But what if the timeline of a mountain was reduced to a human time scale?

“We’re going to have a new way of thinking about these landforms,” ​​he told GlacierHub. “[Mountains] Constantly closing and swinging on our timescale. They are vibrant and full of energy. “

Moore conducted research to support this.in a Learn Published earlier this year in the journal Earth and Planetary Science Letters, he and a team of researchers tracked how the 4,478-meter-tall Matterhorn, which straddles the Swiss-Italian border, sways as global seismic activity continues to vibrate.

led by Samuel Weber geoscientist WSL Avalanche Institute SLF, the study found, that the oscillations of the pyramid-shaped Matterhorn are stimulated by energy transmitted by earthquakes and ocean movements. Their findings also provide important research implications for tracking and monitoring rockfalls and landslides during earthquakes.

Over the past decade, Moore has developed an ongoing interest in what he calls “charismatic” geological features, such as rock arches and towers in Utah. However, the research reported here stems from work earlier in his career investigating the vibrational properties of large landslides at ETH Zurich in Switzerland. When he returned to college from vacation in 2019, he met Simple package, now a computer scientist at the University of Innsbruck in Austria, has been studying the Matterhorn for more than a decade. Moore explained that the interdisciplinary team of researchers worked together to communicate how and why the Matterhorn wobbled.

The Matterhorn, stimulated by ground seismic energy, swayed roughly in a north-south direction. Such computer simulations are grossly exaggerated. Courtesy of Jeff Moore, University of Utah.

Glaciers once carved the Matterhorn’s distinctive peak, called Glacier Point, making it one of the most recognizable and photographed mountains in the world. The extreme geometry of the Matterhorn has also inspired researchers, challenging them to study hard-to-reach points on the mountain, including the summit, to understand how the mountain is affected by persistent seismic vibrations.

While the study provides a complex understanding of geology and geophysics, Moore reiterated that vibration is something everyone experiences every day. When excited, each object vibrates at a specific frequency—the bridge trembles when a car drives over it, and guitar strings tremble when a finger is plucked. The research team applied the same theory to the Matterhorn. Webb was also “fascinated by the idea of ​​a mountain singing,” he told GlacierHub, wondering “if we could record it and how would it sound?”

^{One day of continuous environmental vibration data recorded from the summit of the Matterhorn, accelerated 80 times and became audible.polite Samuel Weber}

To record the Matterhorn’s vibrations, the researchers placed coffee-cup-sized seismometers at several locations on the mountain. Webb explained that by helicopter, they placed one piece of equipment at the top of the mountain, another under the small floor of the Solvay hut, an emergency shelter on the northeast ridge, and one at the foot of the mountain for reference. The seismograph transmits ambient vibration measurements to a recorder, which the researchers then accelerate 80 times so that the mountain’s resonant frequencies can be heard.

Using a helicopter, the researchers placed one seismometer at the summit and another at Solvay Hut, an emergency shelter on the northeast ridge. Courtesy of Jan Beutel, University of Innsbruck.

The researchers installed seismometers on the summit of the Matterhorn at an altitude of 14,692 feet. Courtesy of Jan Beutel, University of Innsbruck.

Their results also show that the Matterhorn oscillates in all directions. For example, a perfectly symmetrical skyscraper would sway in every direction at the same frequency, Moore explained. The same goes for the Matterhorn, which has a unique pyramid shape that moves back and forth from east-west and north-south at similar frequencies, only microns to nanometers. However, in the event of an earthquake, this frequency increases. Seismographs also showed that the Matterhorn was stimulated not only by earthquakes, but also by ocean activity, called microseisms, which are seismic oscillations created by ocean expansion and coastal interactions and propagated inland.

This study has important implications for monitoring rock slope dynamics during earthquakes. For example, during the 2010 Haiti earthquake, rock formations on the ridges suffered more damage than in the valleys because the seismic energy was amplified on the ridges, Moore explained. The researchers’ findings confirm this. At the summit, the measured motion of the Matterhorn is 14 times stronger than at the base. Although the researchers focused on the movement of the Matterhorn, their new understanding can be applied to mountains around the world.

Geoscientist Samuel Weber looks out from the top of the Matterhorn, taking a break as a seismic station is installed at the base. Courtesy of Jan Beutel, University of Innsbruck.

“That’s what all mountains do, from the lowest hill to the Matterhorn,” Moore said. Studying the Matterhorn provides the basis for extreme terrain amplification and vibrations, providing other researchers and geologists with a spectrum of how the mountain responds to seismic activity and information to help the community better prepare for possible impacts on climbing routes and tourism. Be prepared for landslides, rockfalls and rock damage.

Webb said the researchers’ diverse expertise in geology, geophysics and computer science was key to the study’s success, demonstrating the importance of interdisciplinary collaboration. For Moore and his colleagues, the study disproves the widely held belief that mountains are separate, autonomous landforms that evolve over billions of years. Instead, they are connected to the world in ways that transcend human perception. “Just because we can’t experience, feel, hear or see it doesn’t mean it’s not real,” Moore concluded.