The buildings were built on infill/landfill (remblais) which has become sodden (literally a cesspit) and they are sinking/sagging/collapsing in a funnel form???? Could it be a long terrace of buildings perhaps that are collapsing towards the middle?
You havnt highlighted the rest so probably understand it better than me.
Editted, just read the article, they are collapsing from the bottom outwards like an upside down funnel, lack of stability especially laterally for the foundations.
There is a road in the ville of Corbie not far from me where all the houses lean at an alarming angle, when you come to where a sside road joins it the houses on the corner look like an optical illusion, a couple of hundred metres behind there is another parallel road with exactly the same leaning buildings, between the two is a cutting which I think at one time might have been part of the canal network but now dry, its certainly to blame for the subsidence.