Very interesting question! In my opinion, if you mean 'a', you can just say "created earthquake-proof". navitasan If one said 'made to be earthquake-proof' if one had in mind case 'b'.
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navitasanIf one said 'made to be earthquake-proof' if one had in mind case 'b'. the listener would get the impression that the houses were sort of compelled to become earthquake-proof.)I suppose it's common sense that one can't really 'compel' a ho