Jeffrey Johnson got quite a wakeup call this week. The assistant professor of geosciences at Boise State University is working in Pucon, Chile on a Fulbright grant to study volcanoes. He was just ten miles away when the Villarrica volcano had a large eruption Tuesday morning.
Johnson's work includes listening to low frequency sounds that volcanoes make. Here’s the low-frequency sound his sensors recorded during this week's eruption; the sound is normally too low for us to hear, so it's been sped up: