Volcanoes Whistle Like Tea Kettles Before Erupting, But It Would Probably Be the Last Thing You Hear
Hey, what's that sounds? BOOM. Dead.
Before a volcano erupts there can be a series of small earthquakes, sort of like warning shots. They build up in frequency leading to the eruption, which can cause something called "harmonic tremor." New evidence shows that the harmonic tremor can reach the audible range for humans, but if you can hear it, it's probably time to start running.