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I wonder just what the very remote possibility could be, that the building is sitting on formation of shelf bedrock and maybe a 12" + size water main was channeled in through the rock ?
And as the flow rate of the water surging through the pipe rises and falls as the water load demand changes, the water pipe "could" transmit seismic vibrations through the rock, in to the building foundation ? Possible ?? Even IF its so, the vibrations would be very low level.
That said, what you are describing would scare me to death. To be totally honest, if it was me, I'd move immediately, like, tomorrow.
Probably you are braver than me and it will turn out to be nothing. I hope you can figure out what it is. Maybe your landlord knows? What do the other people living in the house think?
First floor you can not even feel it. I am pretty sure it is not the start of a sinkhole there are no sinkholes in the area. Today the shaking has only started in like the last 5omin, it rained on and off for like 5 1/2 hrs today. So what ever is causing the shaking it was started up after the rain ended. Could it be caused by grow house running equipment 2 or 3 younger males rented a big house about 70 ft 80 yards away they have covered all there windows. Slight chance they could be running a grow operation.
You mentioned a concern about the amount of weight in the room. Just curious - How much do you have in the room that would cause you to think about that? I know when I was storing boxes of books I made sure I spread them out and put them along walls. If I saw ceiling cracking in a room below where I had enough weight that I considered 'heavy' I would reduce the load immediately.
Sounds like the second story is not happy with the weight and is suffering under the load. Sort of like too much weight piled on a Christmas tree, and then it collapses. Straight down sort of thing--not tumbles over.
Have you added and added new weight? Sounds like the structure is compromised and ready to go down...trembling under the load. Compressed on itself, until it collapses.
Not to be alarming, but I would be concerned.
Unweight it...take heavy stuff out if you can and see if that helps. Start with books and other solid, heavy objects.
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