World's Largest Subwoofer: Earthquakes 'Pump' Ground to Produce Infrasound

Earthquakes sway buildings, buckle terrain, and rumble - both audibly and in infrasound, frequencies below the threshold of human hearing. New computer modeling by a team of researchers indicates that most of the low-frequency infrasound comes from an unexpected source: the actual "pumping" of the Earth's surface. The researchers confirmed their models by studying data from an actual earthquake.

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