“work out whether the “the risk of building collapse, even in moderate earthquakes, is great” or not..”
Well, Chengdu was hit pretty hard by the 2008 quake – to my knowledge no buildings in the city collapsed. I’d wager the same holds true for any buildings put up since then, altho maybe some structural damage from 2008 weakened some crappy buildings or something I really don’t find a reason to suspect buildings will collapse in anything near or below the 2008 quake, which this one today was nowhere near 😀