@lewm , I live in a bathroom community glued to the side of the greater metropolitan Boston area. I also have an excavation company in my back yard. Can't see them but I can hear them all day long if I walk outside. I hear and see them running inside if I but a a few blocks of wood under the Sota and turn off my rumble filter. Put the tonearm down on a stationary record, put the dust cover down so you are not subjecting the tonearm to any drafts and watch the subwoofers go. Sometimes I can even see the cantilever squiggle a little as something comes in around it's resonance frequency. We do have seismic activity up here but it is always minor by the time it gets to us. I have felt it on several occasions, very spooky. A tonearm needs to be rigidly connected to the platter and both need to be isolated. People will do what they will but, you will never catch me with an outboard arm pod or an unsuspended turntable. Yes, "whew" is more than appropriate.
@pindac , two tectorial plates moving at two inches a year cashed into each other and created the Himalayas, a rock pile 25,000 feet high. So much for mass.
@mulveling , I lost the diamond off a Clearaudio Charisma without a hint of damage to the cantilever. I sent a picture to Musical Surroundings who got a new cartridge and a return packing slip to me in three days. Great service. Then there is the episode with my Double Matrix Pro Sonic but, I will save that for another day.