A volcano in Ecuador with a deep cylindrical crater might be the largest musical instrument on Earth, producing unique sounds scientists could use to monitor its activity. New infrasound recordings of Cotopaxi volcano in central Ecuador show that after a sequence of eruptions in 2015, the volcano’s crater changed shape. The deep narrow crater forced air to reverberate against the crater walls when the volcano rumbled. This created sound waves like those made by a pipe organ, where pressurized air is forced through metal pipes. In this video, listen to the unique sounds of Cotopaxi made audible by modulation with white noise. Read more about the research here: https://news.agu.org/press-release/volcano-music-could-help-scientists-monitor-eruptions/ Video produced by Lauren Lipuma iley.com/doi/10.1029/2018GL077766). Show more