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they generate a constant vibration with a frequency of about 10 millihertz
After discovering the mysterious low-frequency buzz in 1998, scientists figured out that the Earth’s hum is caused not by earthquakes or atmospheric turbulence, but by ocean waves colliding with the seafloor. Now, researchers have pinpointed the source of the Earth’s “background noise,” and it looks like it’s coming primarily from the Pacific coast of North America.
Originally posted by VitalOverdose
This isnt exactly news to most people. The Schumann Resonance has been know about for a long time. Its worth noting that it has increased in frequency just lately.
Dominant source regions of the Earth's “hum” are coastal
Peter D. Bromirski Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
Peter Gerstoft Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
Hum beam power observations using the USArray EarthScope transportable array, combined with infragravity wave observations, show that the dominant source area of the Earth's hum over the 120–400 s period band during winter months is the Pacific coast of North America, with the western coast of Europe a secondary source region. Correlation of hum with model ocean wave heights indicates that the Pacific coast of Central America is an important hum source region when impacted by austral storm waves. Hum is excited by relatively local infragravity wave forcing as ocean swell propagates along coasts, with no indication of significant deep-ocean hum generation.
Received 27 April 2009; accepted 10 June 2009; published 3 July 2009. Citation: Bromirski, P. D., and P. Gerstoft (2009), Dominant source regions of the Earth's “hum” are coastal, Geophys. Res. Lett., 36, L13303, doi:10.1029/2009GL038903.