Earth Hums, and It’s “Loudest” in Europe, Americas

Publication: National Geographic News   Date: August 10, 2009   View Article

Earth hums, and it’s the west coasts of Europe and parts of the Americas that are the main sources of the sound, a new study says.

Since 1998 researchers have known that Earth emits a low-frequency hum inaudible to humans. The sound waves register on instruments used to detect earthquakes even when no quakes are occurring.

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