Electure,
Yeah, mate, all sorts of calcs have to be done by Architects and the Council Building Authorities when a house is being designed.
Houses here are usually built from timber as opposed to brick and by using timber, it gives the houses a bit of "flex" so that it will tend to roll with the movement of the Earth, in a quake.
But you don't see many new houses going up here, that don't have bracing all through it, to stop the studs and dwangs(noggings) from twisting, this is normally done with sheets of plywood and Brace-line Plasterboard.
Paul,
You've never experienced an Earthquake?.
Gotta try it, some time!.