Great discussion here.
R13, while I dont agree with your hypothesis it is well argued. Which i feel one would have difficulty trying to challenge this in a formal (with no further info than the images).
I believe we don't see the large cracks as noted because the majority of the movement has...
My last work place (first engineering job) does all their own foundation engineering as well as structural, however the type of structures are generally simple (residential, commercial steel framed structures etc). I spent more time researching on these geotechnical points than structural...
