5 - Min - Earth Hum - Hazo by Michael Petchkovsky published on 2014-10-16T11:41:14Z This is a five minute recording of electrical fluctuations between two points on the ground, about five metres apart. Hazelbrook, NSW, Australia, 16 Oct, 2014. Mostly 50Hz and overtones as I live near a high voltage transmission line that must drive the ground pretty hard here. Genre ultra low frequency