Not sure how it would work during a blackout, but it sounds like you're listenin... | Hacker News

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		justtoreplyto on April 21, 2015 \| parent \| context \| favorite \| on: Have you heard 'the hum'? Mystery of Earth's low d... Not sure how it would work during a blackout, but it sounds like you're listening to a mains hum. http://en.wikipedia.org/wiki/Mains_hum

simcop2387 on April 22, 2015 [–]

Depending on the blackout cause there could still be live powerlines nearby. If a local transformer blew then the lines feeding it would likely still be live until they shut them off to replace the transformer.

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