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Database Title

11.2 Earth Deformation Database
Keywords
Type1.
Type 11.		 Geology, hazards
earth deformation
Abstract

The database contains:

  • site descriptions for approximately 1000 points from throughout New Zealand and offshore islands
  • files of GPS observations at those points
  • scientific results on the velocity of the points which show the amount of earth deformation at that point
Geographical Coverage New Zealand including offshore islands
Dataset start date. 1990 for GPS data.
Dataset end date. Current
Status/currency. In progress
Update frequency. Velocity measured at points every two - three years.
Maintenance. PGSF funding?

 

Technical Evaluation

  
Parameters- what is measured Dual frequency phase measurements of GPS satellite signals.
Parameters- what is calculated
  • Ground mark coordinates
  • Atmospheric water vapour
Methods used to measure parameters Phase measures are accurate to several mm. The GPS receiver is left at a point for 24-36 hours to measure the velocity of that point.
Secondary sources of data N/A
Scale of use. N/A
Number of records 1000 points
GIS compatibility. Yes
Available formats for users. Digital
Access constraints. Varies depending on circumstances (type of use and user)
Measurement Accuracy Better than 5mm horizontally and 10mm vertically.
Completeness of dataset Complete in the sense that it contains all the measurements IGNS have made.
Positional accuracy See above.
Database steward IGNS
Database custodian IGNS
Database custodian contact person Desmond Darby
Database custodian Contact
Address

Phone
Fax
Email		 IGNS
P.O. Box 30 368
Lower Hutt.
+64 4 570 1444
+64 4 570 1440
desmond.darby@gns.cri.nz
References  
Date metadata record prepared. October 1999
Author of metadata record. Victoria Froude

 

Management Evaluation

  
Original purpose. To provide crustal deformation measurements for seismic hazard research
Relationships with classification systems. N/A
Relationships with other databases The precise coordinates of the points are in the Geodetic database managed by LINZ.
Known relationships with proposed EPIP indicators. N/A
Who uses this database?
  • Mainly earth science research
  • The data is used indirectly by the survey profession as the results are fed into the survey datum
Public awareness of the database Nil
Database strengths.
  • Precision
  • Integrity of data
Database limitations. Database structure is not fully developed (e.g. different file formats)

 

What are the Current and Emerging Uses of the Database for:

  
Assisting with determining historic state/baseline. It can assist with determining historic baselines.
Assisting with determining current state/baseline. It describes current deformation.
Assisting with modeling possible future outcomes. Can be used to assist with hazard predictions
Risk assessment. As above.
Monitoring site selection and sample design. N/A
Aggregating and reporting data locally, regionally or nationally. N/A