A model of active faulting in New Zealand : fault zone parameter descriptions

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Litchfield, N.J.; Van Dissen, R.J.; Sutherland, R.; Barnes, P.M.; Cox, S.C.; Norris, R.J.; Beavan, R.J.; Langridge, R.M.; Villamor, P.; Berryman, K.R.; Stirling, M.W.; Nicol, A.; Nodder, S.D.; Lamarche, G.; Barrell, D.J.A.; Pettinga, J.R.; Little, T.A.; Pondard, N.; Clark, K.J. 2013 A model of active faulting in New Zealand : fault zone parameter descriptions. Lower Hutt, N.Z.: GNS Science. GNS Science report 2012/19 120 p.

Abstract: A nation-wide model of active fault zones in New Zealand has been compiled. The model serves three main purposes: 1) to provide an overview of permanent strain based on active fault data; 2) to refine fault source information in the New Zealand National Seismic Hazard Model; and 3) to underpin a synthetic seismicity model for the Wellington region. The purpose of this report is to document the parameters compiled for each fault zone, and briefly describe the data sources and the basis of interpretations. We include references to all relevant published papers, as well as to relevant unpublished data sources, such as university theses. A total of 635 fault zones have been compiled, including 4 subduction interface fault zones. The fault zones are represented by simplified fault traces suitable for modelling at national or regional scales. Generalised estimates of geometric (dip and dip direction) and kinematic (sense of movement, rake and net slip rate) parameters have been provided for most fault zones, along with assigned uncertainties. In addition, a ‘quality code’ provides an indication of the quantity and type of data available for each fault zone, particularly weighted toward the quality of the slip rate data. (auth)