Building collapse in Miami: Multiple factors could have contributed, experts say
USA Today - 06/28/2021
If the foundation was under stress and moving, it would almost certainly have been apparent for weeks, if not longer, said Mehrdad Sasani, a professor of environmental engineering at Northeastern University in Boston.
“Usually, such failures are not sudden,” he said. “People should have seen (substantial) cracks, they should have heard noises for a long time. Unless this is an exceptional case, usually foundation failure is more gradual and there are lots of signs.”