The Earth Has An Eerie Hum, And Now We Know What's Causing It

April 16, 2015 12:15 PM

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The Earth Has An Eerie Hum, And Now We Know What's Causing It

Scientists have long known that Earth produces an eerie low-frequency hum that's inaudible to humans but detectable with seismic instruments. But as for what's causing this "microseismic" activity, scientists have never been sure.

A new study published online Feb. 10, 2015 in the journal Geophysical Research Letters indicates that the hum is largely due to ocean waves that cause our planet to vibrate subtly -- or "ring," as the researchers put it.

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