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Layer: Active Faults 2019 GNS (ID: 1)

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Name: Active Faults 2019 GNS

Display Field: NAME

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This active fault dataset, prepared by GNS Science under contract to Otago Regional Council (ORC), is based on the GNS Science QMAP (Quarter-Million-scale geological mAP) dataset 'faults' layer. </SPAN></P><P><SPAN>The base dataset was extracted from the nationwide QMAP 'seamless' dataset (Heron 2014) in mid-2017. That dataset is sourced from original geological map data represented in the Queenstown Lakes and Central Otago districts by the Wakatipu map (Turnbull 2000; western parts of both districts), Haast map (Rattenbury et al. 2010; headwaters of the Wanaka and Hawea catchments), Murihiku map (Turnbull and Allibone 2003; southernmost part of Central Otago District) and the Waitaki map (Forsyth 2001; eastern part of Central Otago).</SPAN></P><P><SPAN>The extracted QMAP faults dataset was modified by the addition of three new attribute fields, the repositioning of some faults or parts of faults, and the addition of new faults. The three new attribute fields are:ORC_name (local name for the mapped feature(s))CertaintySurf_formA single active fault at depth is commonly expressed at the ground surface as a zone of splintering. An individual line of splinters (fault strand) may comprise fault offsets of the ground surface (fault scarps) or ground-surface folds (fold scarps), and typically a mixture of both. </SPAN></P><P><SPAN>A fault zone may include several lines (traces) of semi-parallel strands and a fault zone can in some cases be several kilometres wide. Some strands have previously been named separately, and this name is retained in the GIS dataset, but the various strands that comprise an active fault are grouped under a common name (ORC_name). This is done to highlight that, collectively, the strands are regarded as part of a single active fault structure, whose movements at depth have produced an array of ground-surface fault and/or fold deformation.</SPAN></P><P><SPAN>The Certainty attribute indicates the assessed level of the certainty with which each feature is recognized as an active fault (definite, likely or possible) or as a potentially active fault.The Surf_form (Surface form) attributes provides an interpretation of the surface distinctiveness of each feature at the ground surface (well expressed, moderately expressed, not expressed, unknown). The QMAP faults dataset contains many attribute fields that are not important for the dataset described here, and those fields have been deleted from this dataset. However, to make clear the linkage between the QMAP dataset and this active fault dataset, five of the QMAP attribute fields are retained, comprising ‘NAME’, ‘ZONE’, ‘DOWN_QUAD’, ‘QMAP_NAME’ and ‘QMAP_NUMB’. </SPAN></P><P><SPAN>The 'NAME' and "ZONE' fields respectively provide the fault name (if any) and any fault zone with which is is assocated, mainly as applied in QMAP. The 'DOWN_QUAD' indicates the relative direction of fault movement, by stating which side of the fault is downthrown (e.g., north, northeast, east, southeast, south, southwest, west, northwest). The last two fields refer to the original published QMAP sheet name, and the published sheet number. For fault features that are newly added (i.e., not on QMAP), these latter two fields carry a NULL entry. Unless indicated otherwise, all the fault data have been compiled at a regional scale (1:250,000) and the locations of active and potentially active faults should be regarded as having a general accuracy of ± 250 m, and at best, ± 100 m. </SPAN></P><P><SPAN>The geographic coordinate system for the data is New Zealand Geodetic Datum 2000.</SPAN></P></DIV></DIV></DIV>

Service Item Id: 427a74ecab3542c29739164356efd695

Copyright Text: Modified dataset compiled by D.J.A. Barrell. Data described and documented in: Barrell, D.J.A. 2019. General distribution and characteristics of active faults and folds in the Queenstown Lakes and Central Otago districts, Otago. Lower Hutt (NZ): GNS Science. 99 p. GNS Science Consultancy Report 2018/207. Original source reference: Heron, D.W. (custodian) 2014. Geological map of New Zealand 1:250,000. Lower Hutt (NZ): GNS Science. 1 CD. GNS Science Geological Map 1. Individual QMAP sheet references: Turnbull, I.M. 2000. Geology of the Wakatipu area. Lower Hutt (NZ): Institute of Geological & Nuclear Sciences. 1 map + 72 p. Institute of Geological & Nuclear Sciences 1:250,000 Geological Map 18. Forsyth, P.J. 2001. Geology of the Waitaki area. Lower Hutt (NZ): Institute of Geological & Nuclear Sciences. 1 map + 64 p. Institute of Geological & Nuclear Sciences 1:250,000 Geological Map 19. Turnbull, I.M.; Allibone, A.H. 2003. Geology of the Murihiku area. Lower Hutt (NZ): Institute of Geological & Nuclear Sciences. 1 map + 74 p. Institute of Geological & Nuclear Sciences 1:250,000 Geological Map 20. Rattenbury, M.S.; Jongens, R.; Cox, S.C. 2010. Geology of the Haast area. Lower Hutt (NZ): Institute of Geological & Nuclear Sciences. 1 map + 58 p. Institute of Geological & Nuclear Sciences 1:250,000 Geological Map 14.

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Supported Query Formats: JSON, geoJSON, PBF

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Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

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Type ID Field: Certainty

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