I came across this site when I was reading tsunami news. It's a weird theory about ear ringing - and how some people sensitive to picking up this 'hum' might be picking up an earth vibration, that could be a predictor of earth movements or some other event happening on our world.
Every once in awhile, I would hear a tone, which is hard to explain -- its kind of like a high-pitched tone, and it would only last for a few seconds. I always attributed it to getting some new programming downloaded to my brain by the aliens....
http://www.terraresearch.net/article...es_article.htm