I remember back in 89 when I had the misfortune to be in the Loma Prieta-Centered earthquake when I was in Palo Alto. The WORST damage seen was in those areas that had been landfilled of one sort or another. It seemed those areas that had been ‘filled’ were actually amplifying shockwaves and causing more destruction.
Landfill ain’t bedrock. Hard to believe engineers don’t know the difference.