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Sounds we can't hear teach us about lava lakes

Detailed Description

A bursting bubble on the surface of a lava lake produces an impulsive signal on an infrasound recording. This photo shows a group of bubbles about 5 m (16 ft) across bursting on the Halema‘uma‘u lava lake at the summit of Kīlauea Volcano. The blue line is an infrasound recording of 50 seconds of similar activity. Each peak in the graph represents the sound made by such a bubble burst. USGS photo by M. Patrick; infrasound data courtesy of G. Waite.