The ground below man made construction is a work in progress. If you think about it the current so called modern society with massive building in the cities and suburbs has only been a round for a few centuries at best which is a spec of time in the grand scheme of things. Big whup nothing happened the last 75 years or so, that doesn't mean that the 76 year is only the end of the first second.
One must wonder what the engineers or codes required for testing of the ground below. Or did they bother to do required test or any at all. Man has been very presumptuous and arrogant thinking they know everything based on their experience. I know people have lived in homes 40 years plus and wonder why they are having to do so many repairs not once but twice. Their previous experience was living less than 10-20 years in a smaller home or apartment not seeing the wear & tear cycles wether it be the floors, roof, paint, tree trimming etc. If you see cracking in walls or ceilings that is a sign things are moving even though fractions of inches per year. This is why one shouldn't finish/panel a basement or any wall/ceiling actually so you can see what goes over the course of time. I'm sure there were signs of movement or forming sink hole prior.
TIME, a lot of things happen over the course of time and you are probably not at the beginning or end of a period of time.