I owned two Linns over the years and they have to be the poorest suspended turntables made. Very unstable.
Setup is everything with turntables and the Linn is one of the trickiest to get right. In that sense, it’s a bit like the Oracle Delphi. The Linn isn’t my cup of tea, but to dismiss them as "the poorest suspended turntables made" is just silly.
There is loads of low frequency noise in the environment that is transmitted to the turntable ... A severe earthquake is just visible evidence of a wave traveling through the ground. The earth is quaking all the time
An earthquake isn’t visible, although the result of an earthquake may be. Neither is an earthquake a "wave traveling through the ground" and it is certainly completely false that earthquakes are happening all the time.
An earthquake is "is the sudden movement of Earth’s crust at a fault line" which itself is the result of shifting tectonic plates. That is the word from NASA. An earthquake is an event and they are monitored around the world. @mijostyn, your scientific theories are fanciful and imaginative, but they also reveal that much of science isn’t intuitive, at least for you.
I can hammer the side of the plinth and you can not hear a thing and I mean hard enough to dent the wood if I did not have a wooden block in the way. Try that with your table ...
I don’t need to hammer my turntable to know that it’s well isolated.