Wrt concrete: Everything vibrates and every thing has a resonance frequency. The earth vibrates around three cycles per second. Resonance occurs when the frequency of excitation equals the natural frequency of an object - the so-called critical frequency. When resonance occurs, the amplitude of the vibration increases; it is limited only by the damping or abatement available to the object.
What is the resonant frequency of concrete? According to this site, the resonant frequency of concrete is 100Hz - 200Hz. At what frequency do subwoofers operate?
How well does concrete transmit vibration? How well does rebar transmit vibration?
All good info.
It also depends on what type of soil one's house rests upon.
My land is largely ledge which helps a bit.
My subs work below the 100-200 hz region.
So if your info is correct, I would think they have little effect on the floor.
Would be interested to know the dB level of Earth's 3 Hz constant vibration.
Possibly too low to really matter...