The 1:250,000 Active Faults Database of New Zealand : database description and data dictionary

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Langridge, R.M.; Ries, W.F.; Litchfield, N.J.; Van Dissen, R.J.; Villamor, P. 2014 The 1:250,000 Active Faults Database of New Zealand : database description and data dictionary. Lower Hutt, N.Z.: GNS Science. GNS Science report 2014/11 20 p.

Abstract: This report represents a summary of a decadal update of one of the key databases held and maintained within GNS Science, the Active Faults Database of New Zealand. The main output of this work is a new realisation of the database, at 1:250,000 scale (hereafter referred to as the 1:250k Active Faults Database). Active faults are defined as faults that have ruptured/caused ground deformation during the last 125,000 years, except in the Taupo Rift where the timeframe of activity is the last ~25,000 years. The database is presented spatially in a Geographic Information System (GIS), as lines which represent active fault surface traces, with corresponding attribute fields. An important goal of this work (Section 1) has been to construct a database at a uniform scale (1:250,000) that is consistent with other GNS Science databases, particularly the QMAP Geological Map of New Zealand (QMAP). An important role of this database is to allow users to be aware of the presence and location of active faults. Linework has been derived primarily from QMAP and the existing, multi-scale GNS Active Faults database (hereafter referred to as the AFDB2003). Within the 1:250k Active Faults Database fault trace data are merged to form faults (and sometimes fault sections and fault zones). Section 2 of this report describes the philosophy, steps and rules that were used in developing the 1:250k Active Faults Database. The Data Dictionary (Section 3) provides definitions of, and guidelines on how we compiled, each attribute field in the 1:250k Active Faults Database. Attribute fields, in numeric or character form, provide information about the fault trace data (e.g., ACCURACY) and fault activity parameters (e.g., SLIP_RATE). The 17 attribute fields are the result of integrating and simplifying existing GIS active fault attribute fields (e.g., from the AFDB2003 Database and/or QMAP). This report is aimed primarily for users within GNS Science and the science community but certainly has wider applicability. The intent is that the 1:250k Active Faults Database will be viewed and used online (http://data.gns.cri.nz/af/) and also be easily downloadable as a product for uptake by a range of users from local councils to the general public. For this reason, the database comes with a Disclaimer that describes its limitations with respect to scale and accuracy. The 1:250k Active Faults Database and the AFDB2003 will be maintained and updated as new data come to hand. We also hope in future to be able to include more active folds and offshore active faults. (auth)