There is a similar hum that plagues our neighborhood from time to time. Nobody can figure it out. Water pressure (cavitation), underground power lines, generators, water pumps, sump pumps, gas lines all have been suspect but none have been singled out. Entire blocks have been affected. The low frequency hum penetrates ear plugs and will drive one quite insane. Thank goodness it goes away after a while. Anywhere from a week to three or four.
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