LINZ have published LINZ Bulletin No2 - Unproven Marks and Category 5 Boundary Definition. This information is relevant to surveyors working in Canterbury and gives advance notice of provisions for capturing unproven marks and additional guidance for definition in category 5 areas. 

 View Bulletin No 2 here: http://www.linz.govt.nz/survey-titles/cadastral-surveying/canterbury-earthquake/rules-guidelines-2010.