Vibrating buildings/&question

[David Renaud]

 22 years tuning and this is a new one on me..... 
 
  Music school just moved to their new facility.
  They have a  new Yamaha G3 in a small hall that
could seat 120.

  There is what sounds like soundboard vibration or 
loose cabinet part. Pausing still the vibration is
continuous as the piano sits quietly dormant.

  Squeezing the lid halves it disappears.
  The whole piano is gently vibrating 24 hours a day.
  Sounds like a little mouse chewing as the polyester
  parts vibrate together just enough to move  
intermittently against each other.

  The new building has steel frame under the floor.
It conducts vibration from the furnace very
efficiently. A gentle st ready vibration barely
noticeable unless you touch a piece of door frame.
Even then it is only just detectable.

  Question: Any ramifications for stability?
            Have any university techs run across
            this vibrating floor effect and noticed
            some lack of stability. 

                            Cheers
                            Dave Renaud







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