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YELLOWSTONE NATIONAL PARK — Continuous infrasound monitoring has been established in Yellowstone National Park (YNP), and scientists at the Yellowstone Volcano Observatory (YVO) are listening in on the underground activity of geysers.

According to this week’s Caldera Chronicles written by YVO and Scientist-in-Charge Michael Poland, infrasound refers to low-frequency acoustic energy that is below the range of human hearing. It travels at a significantly slower speed than seismic waves and experiences little atmospheric absorption, which means it can trave

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