reply to post by stirling
Here's a USGS link with some info.
There's a link in there about noises associated with the New Madrid quakes too.
I live in PA & the first time I heard the Seneca Guns was when Chile had their big quake.
I looked at the clock when I heard it & found out later that it was at the exact same time!
People 35 miles away from me heard it too & were talking about it.
A lot of people heard it, but didn't know what it was!
My sister has a friend in Ohio, it woke them up it was so loud.
They thought it was somebody pounding on their door!
So it was heard over a large area!
We've heard it at least three times since. The last time was Thanksgiving afternoon.
That time it shook the house & rattled windows!
It's a lot easier to hear at night, & be sure what it is, as there is less background noise.
During the day you tend to second guess youself....especially if there is only one boom!
But in the middle of the night, in our semi rural area, it's very quiet.
It's very impressive, especially when there are a series of them!
One night there was even a metallic scraping sound.
At first I thought it was a car accident & two cars had broadsided each other.
That's just what it sounded like, but lasted a lot longer than what two cars would have!
I've lived here most of my life & never heard it until that first one three years ago.
I would have noticed as this area was even more quiet before, even in the daytime!
If you hear a really good one, you will never forget it!
How something coming from underground could be so loud?
Sometimes a single boom, sometimes a series, sometimes scraping like a fault is moving.
Sometimes a combination of both!
One night there was a huge snap or crack in the outside wall of the upstairs bedroom!
It was after I had gone to bed in that room! It sounded like a 2 x 4 had snapped!
The cat was on the bed & he jumped & froze in place with his ears back!
I was waiting for something else it was sooo loud. But that was all.
I expected cracked plaster, or damage on the outside...but there was nothing!
There is definitely an increase in the activity!
It makes me wonder...the little creaks & groans in houses,
that people always say are the 'house settling'? Maybe it's not!
Maybe it's slight movement! Ours was built 86 years ago, it should be done already!!!
I sure hope our house isn't built over a fault line!!!