AnomalySounded like a train in the distance that never ended but there are no cargo trains in the entire country. Maybe an idle engine for at least an hour. My wife wasn't able to hear it. The sound definitely seemed external to me because it would have a different volume based on what room of the house I was in. I turned off everything in the house to make sure it wasn't something inside that was causing it.
Granadilla, San Jose · 2019-07-30 · from the WORLDHUMMAP archive
An account in Granadilla, San Jose
What they reported
First noticed: 2010
Pitch: Maybe something like 65Hz sine
Loudest: During the night
Where: Indoors
Symptoms: Just annoyance
Changes with weather: Unknown. Its not always there.
Has this happened to you?
Write it down while you still remember the details. We will look for the others.
Tell us what you sawKnow someone this happened to?
If this reminds you of something a friend or a relative told you once and never mentioned again, send them this page. Reading that a stranger described the same thing is usually the part that helps.
Nothing is tracked back to you and nothing is sent on your behalf. The link is just the page you are reading.
This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.