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Dominant source regions of the Earth's “hum” are coastal
Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
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: (2009), Dominant source regions of the Earth's “hum” are coastal, Geophys. Res. Lett., 36, L13303, doi:10.1029/2009GL038903.
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