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Seismic Noise.

The Earth Has An Eerie Hum, And Now We Know Why

The Huffington Post | Jacqueline Howard | Posted 04.16.2015 | Science

Scientists have long known that Earth produces an eerie low-frequency hum that's inaudible to humans but detectable with seismic instruments. But as f...

Global 'Hum' Helps Scientists Probe Planet's Core

Posted 11.23.2012 | Science

By: Charles Q. Choi, OurAmazingPlanet Contributor Published: 11/23/2012 10:40 AM EST on OurAmazingPlanet The global "hum" of the Earth is now help...