Re-establishment of Cadastral Boundaries following the Canterbury

Earthquakes, September 2010 to June 2011

Mark Smith, Mack Thompson, Don Grant

Land Information New Zealand

NZIS/SSSI Conference 23-25 November 2011Wellington, New Zealand

Where Were these Quakes?

Fault shear and distortion

Liquefaction and surface flow

Effects on Boundaries

• Block shifts Deep

• Shearing Deep

• Angle distortion Deep

• Surface flow Shallow

• Landslip Shallow

• Rock Fall Shallow

New Zealand Cadastral Survey System

• Supports Torrens title system

• Integrated with geodetic

• Private sector surveyors

• Cadastral Survey legislation

• Hierarchy of evidence

• Old Monuments have priority

• Certainty of boundaries desired

Surveyor-General’s Concerns

Earthquake affect on cadastral boundaries

• How to re-establish boundaries?

• Statutory intervention required?

• Surveyors’ legal authority?

Precedents?

– No NZ Statute or regulation

– No common law

– Napier Earthquake (1931)

– Prior NZ examples

– Few overseas precedents

– Alaska (1964) and California (1971)

Statutory intervention required

Boundary Re-establishment

Deep Seated Movement• Boundaries move with the surface

• Extra angles created in fault-span boundaries

Shallow surface Movement• Boundaries remain relative pre-EQ positions

Specific non-compliances sanctioned by S.G.

Managing the Spatial Cadastre

Further Information

Proceedings of this conference

And

LINZ web site

http://www.linz.govt.nz/

Search for “earthquake”