The term affected boundary is defined in Rule 20.1 as a boundary where earthquake movement has changed it in excess of the relevant accuracy tolerances and it has not already been redefined in terms of that earthquake movement and recorded in an approved CSD.
An approved CSD includes an approved interim survey approved before the Canterbury Property Boundaries and Related Matters Act 2016 came into force.
When an affected boundary is redefined, it is subject to the provisions set out in Rule 20. An affected boundary can be a primary or non-primary parcel boundary.
A boundary that has been redefined in terms of earthquake movement may subsequently become an affected boundary again if it is subject to further earthquake movement caused by a later earthquake (any earthquake in the period ending on 13 February 2022 - see s4 Canterbury Property Boundaries and Related Matters Act 2016).