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Yes that 400x 400 x 600 pier base would be pretty stable in shallow natural soil down to sandstone. Love those screw in masonry anchors.
I can walk around carefully on my concrete deck while imaging as it is on top of concrete walls, beams and deep concrete piers.
With 3m deep clay soils such as we have here the soil moves seasonally up to 1 cm and about 1mm a year downhill so even a deep pier would require checking and adjustment to remain on alignment.
Bad Vibration however is a whole different problem , such being on a main road or train line. Or a neighbour likes to excavate his basement at night.
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