OK mystery solved according to the AGU. Just seem a report on their site about how planes cause the round circles in clouds rather than them being haarp or UFOs. Their explinations are "Cause we said so" sort of approach. SO I don't feel they have it right on these sounds, but who knows this may help.
t
GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L13303, 5 PP., 2009
doi:10.1029/2009GL038903
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.
http://www.agu.org/pubs/crossref/2009/2009GL038903.shtml
t
GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L13303, 5 PP., 2009
doi:10.1029/2009GL038903
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.
http://www.agu.org/pubs/crossref/2009/2009GL038903.shtml
I pray it was only temporary, although obviously it shouldn't be at all. At the risk of offending you, anything we can do to help? Sending love your way. 
