The following page summarises the main characteristics of the DMN sub-networks.
National deformation marks
Purpose
To determine and monitor national-scale tectonic deformation
Density
Across North Island, South Island, Stewart Island/Rakiura
Every point in NZ within:
- 100 km of one national DMN mark
- 300km of three national DMN marks
Accuracy
Order: 1
Tier: Horiz A (0.05 m), Vert B (0.10 m)
Class: Horiz III (0.003 m, 1x10-7m/m), Vert IV (0.003 m, 3x10-7m/m)
Class evaluation radius: 300 km
Mark characteristics
Continuous GNSS
PositioNZ network
Location
Stable part of tectonic plate
Suitable for collecting GNSS observations
Mark access
Data available from LINZ website
No physical access to mark
Regional deformation marks
Purpose
To determine and monitor regional-scale tectonic deformation
Density
Across North Island, South Island, Stewart Island/Rakiura
Sheer strain >0.2 μrad/year, every point in NZ within:
- 20 km of one regional DMN mark
- 50km of three regional DMN marks
Sheer strain <0.2 μrad/year, every point in NZ within:
- 35 km of one regional DMN mark
- 70km of three regional DMN marks
Accuracy
Order: 2
Tier: Horiz B (0.10 m), Vert E (0.25 m)
Class: Horiz V (0.003 m, 1x10-6m/m), Vert VI (0.01 m, 3x10-5m/m)
Class evaluation radius: 50 km
Mark characteristics
Campaign GNSS
Location
Best location for monitoring deformation
Suitable for collecting GNSS
Mark access
Physical access to marks to collect GNSS observations
Local deformation marks
Purpose
To determine and monitor regional-scale tectonic deformation
Density
Across North Island, South Island, Stewart Island/Rakiura
Urban areas with sheer strain >0.5 μrad/year, every point in NZ within:
- 3 km of one regional DMN mark
- 6 km of three regional DMN marks
Urban areas with sheer strain <0.5 μrad/year, every point in NZ within:
- 5 km of one regional DMN mark
- 10 km of three regional DMN marks
Rural areas with sheer strain >0.5 μrad/year, every point in NZ within:
- 10 km of one regional DMN mark
- 20 km of three regional DMN marks
Accuracy
Order: 4
Tier: Horiz C (0.15 m), Vert F (0.35 m)
Class: Horiz VII (0.01 m, 1x10-5m/m), Vert VIII (0.01 m, 5x10-5m/m)
Class evaluation radius: 6 km (urban), 20 km (rural)
Mark characteristics
Campaign GNSS
Location
Best location for monitoring deformation
Suitable for collecting GNSS
Mark access
Physical access to marks to collect GNSS observations