Saw this on the block below uncle's apartment. I have never seen a vibration monitor!
There have been earthquakes around the world, but I doubt it is for monitoring that.
There's a lift upgrading on that block, so it's probably for monitoring the piling works going on.
But there's also the Downtown Line construction not too far away, but I doubt this can monitor vibrations so deep below.
They sure have lots of monitoring devices nowadays eh?
Sometimes I wonder if it's to be considerate to residents, or it is to prove it's not noisy when someone wants to sue the construction company. :-)