Afew days ago I read about Auckland, New Zealand-several people there report hearing a low, humming sound, at just about the limit of perception. An acoustic expert was called in to investigate. Anyway, I heard about the village of Moodus, CT-where people have been hearng mysterious noises for hundreds of years-even the indians had stories about the strange sounds. Anybody have personal experiences with these sounds? What causes them? 
Try searching on “Taos Hum”. I seem to recall there was a Cecil (or SDSAB) column about it.
I’ve done some reading on the noises, and they are not a hum, but mysterious explosion sounds, similar to cannon fire, thunder, and seismic activity.
Here’s a link: curbstone.org - This website is for sale! - curbstone Resources and Information., and this one: http://www.easthaddam.net/recreation/
MOODUS NOISES
Today, the mysterious noises are more folklore than reality. Apparently located in an area of East Haddam which includes Cave Hill and Mount Tom, where the Salmon and Moodus Rivers come together, legend tells of loud and sometimes violent ground quakes. The early inhabitants of the area, the people of the Pequot, Mohegan and Narragansett tribes believed the rumblings were brought on by the god Hobomoko. They called the area Machimoodus meaning, “the place of bad noises.” Many other legends and tales have been passed along to describe the reoccurring noises including chemical explosions beneath the earth, the pressure from a giant pearl which blocked an underground cavern, and pearls in the mussels in the Salmon and Connecticut Rivers. Modern instruments and geophysical research have attributed the Moodus Noises to shallow “micro earthquakes.”
I’ve canoed many times in the Moodus Reservoir, but I’ve never heard the noises, or if I have, they’ve been indistinguishable from the gunshots of hunters in the area.
I thought I’d relate what the Appalachian Mountain Club’s Canoe & Kayak Guide says about the reservoir:
“Moodus comes from the Pequot Indian word machimoodus, meaning “land of noises.” The area’s loud booms have mystified residents for hundreds or even thousands of years. A deep fault line may cause these booms, which a resident says sound like sonic booms and which generally cannot be felt–only heard. These tremors should have no impact on your paddling (although neither the authors nor AMC can guarantee a huge chasm won’t suddenly open up–emptying the reservoir and swallowing you and your boat).”
My wife was less than thrilled when I first mentioned that tongue-in-cheek aside from the book as we paddled across the reservoir. 