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http://www.abc.net.au/science/articles/2008/04/17/2219939.htm?site=science&topic=latest
A subtle and mysterious global hum has been detected by seismologists studying records from Earth's most boring seismic stations.
The newfound vibration is made of two-minute to five-minute, side-to-side surface seismic waves, called Love waves.
				
			A subtle and mysterious global hum has been detected by seismologists studying records from Earth's most boring seismic stations.
The newfound vibration is made of two-minute to five-minute, side-to-side surface seismic waves, called Love waves.