Mexico is infamous for corruption as most know. The "Mordida" is away of life, and Government officials depend on these payoffs to "sign off" on construction, since they only make a out $600 a month.Seems to be just cheap, shoddy concrete work. No excuse.
When I lived in New Mexico, a brand new house we bought started sinking. We inquired with a lawyer who said our home was built on a sandy aluvian plain. He reiterated that you can build a house on quick sand, but it has to be engineered for quicksand.I think I read that Mexico City rests on an ancient caldera with a spongy swamp like terra un-firma unsuitable for any structure.
Then add the unscrupulous building contractors and business as usual is a recipe for disaster.
Building structures in an known earthquake fault zone without regard to safe guards is criminal.
Again so sad that human life is wasted because of greed and perhaps very bad planning !
Was no joke. Almost lost my house until builder bought it back. It's sandy high desert which is extremely susceptible to liquefaction during their extreme monsoon rains.Where was that in NM - I thought that NM was all high desert - stable terrain ?
Quick Sand only something found in "B" Hollywood movies ! LOL !