You can model the up and down pattern of the sound that the volcano makes in the audible range by playing a kazoo made from a straw. Can you identify where the sound changes? Listen to the Villarrica volcano’s sound. This difference in the sound can tell us how soon the volcano might erupt or even whether a volcano is more active. The higher up in the volcano’s chamber the magma is, the higher-pitched the sound is, and the lower the magma in the chamber, the lower the sound. Instead, scientists are interested in the sound that comes from deep underground as the magma changes position before an eruption. But scientists don’t listen to the sounds you hear as a volcano is erupting. Infrasound is one type of data that can indicate that the volcano is becoming more active. It can be a useful tool to help gather information about when or if a volcano might erupt. Sound is important to the work of many volcanologists-scientists who study volcanoes, lava, magma, and related geological phenomena. ![]() Note: As you move through this activity, there are different clips from Johnson’s interview with Science Friday. ![]() Let’s check in with Johnson for more information about the sounds of volcanos. Science Friday sat down with Jeffrey Johnson, an associate professor of geophysics at Boise State University to talk about what we can learn by listening to volcanos.
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