Strange humming sound in Olympia, Washington – April 18 2014

strange sounds olympia, olympia hum april 2014, strange sounds in olympia washington april 2014, humming noise olympia, strange noise olympia, strange sounds in the sky olympia april 2014, State Capitol, Olympia, Washington, December 12, 2004.
State Capitol, Olympia, Washington, December 12, 2004. Photo: Wikipedia

The source of the Olympia’s hum have been unsuccessful, although idling trains, pressure washers and heat pumps have been suspected. The mysterious, low frequency noise occurs typically between 10:30 p.m. and 3 a.m and is becoming a big problem. – The Olympian

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