Name: Canterbury Fault Awareness Areas and Fault Avoidance Zones 2024

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Description: The fault awareness areas and fault avoidance zone sshow areas where there may be a surface fault rupture hazard. Surface fault rupture is the permanent breaking, ripping, buckling or warping of the ground on or near the line where a fault meets the ground surface, as a result of an earthquakeon the fault. It is different from earthquake shaking.The fault awareness areas are derived from faults mapped at a broad scale of 1:250,000 for Environment Canterbury by GNS Science between 2009 and 2019: Kaikoura (2015, updated 2019), Hurunui (2012), Waimakariri (2013, updated 2019), Selwyn (2013), Ashburton (2009), Timaru (2017), Mackenzie (2010), Waimate (2017) and Waitaki (2017). There is no dataset for Christchurch City as there are no known earthquake faults at the ground surface in the Christchurch City or Banks Peninsula area.This dataset has been created as recommended in Barrell, et al, 2015, Guidelines for using regional-scale earthquake fault information in Canterbury. GNS Science Consultancy Report 2014/211. A 125m or 250m buffer was placed around the mapped fault traces to create this polygon dataset, depending on how certain the fault is, and how well expressed it is at the ground surface. Definite (well expressed and moderately expressed) fault and monocline records and likely (well expressed and moderately expressed) fault and monocline records have a 125m buffer, recognising that the mapped location of the fault is fairly well constrained and is reasonably close the actual location. All other faults and monocline records have a 250m buffer, recognising the the mapped location is not as well constrained. See Barrell, et al, 2015 for a full description of the method used to create this polygon dataset, and recommended actions for each type of area.The fault avoidance zones are derived from more detailed fault mapping (generally 1:10,000 or better, using LiDAR) undertaken between 2004 and 2024 for faults closer to populated areas where more detailed mapping is needed for land use planning. These include: several faults in Kaikoua, the Hanmer Fault (Hurunui District), Ashley Fault (Waimakariri District), Greendale Fault (Selwyn District) and the Ostler Fault (Mackenzie District). Descriptions of the attribute fields:Name: Fault name, generally taken from the district fault name field (e.g. KDC_name) in the district fault datasets or the fault name in the fault avoidance zone datasets. Some of these have been changed or updated from the original district fault names to make them consistent with fault names in neighbouring districts.Zone:Fault zone that the fault is within, if any.Certainty:The level of confidence that the mapped feature is in fact an active earthquake fault - definite, likely or possible. See Barrell, et al, 2015 for full descriptions.Surface form:How clearly the mapped feature can be seen at the ground surface - well expressed, moderately expressed, not expressed or unknown. See Barrell, et al, 2015 for full descriptions.Min RI:Minimum fault recurrence interval, taken from the summary table of each district fault report, or updated with more recent information.Max RI:Maximum fault recurrence interval, taken from the summary table of each district fault report, or updated with more recent information.Min RI Class:Minimum fault recurrence interval class (as defined in Kerr, et al, 2003, Guidelines for development of land on or close to active faults), taken from the summary table of each district fault report, or updated with more recent information. Some values have been changed to better match the minimum fault recurrence interval.Max RI Class:Maximum fault recurrence interval class (as defined in Kerr, et al 2003, Guidelines for development of land on or close to active faults), taken from the summary table of each district fault report, or updated with more recent information. Dom sense:Dominant sense of movement on fault - dextral (strike-slip), sinistral (strike-slip), reverse, thrust or normal. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.Sub sense:Secondary sense of movement on fault - dextral (strike-slip), sinistral (strike-slip), reverse, thrust or normal. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.Down quad:Which side of the fault has gone down relative to the other side. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.District:District that fault is within.Buffer: Whether a 125m or 250m buffer has been applied to the fault to create the fault awareness area as per Barrell, et al, 2015. Or the buffer distance used for fault avoidance zonation.Poly_type: Whether the polygon is a fault awareness area or a fault avoidance zone, as described above.Date: Year the information was created.Report: Report that accompanies the information.Author: The organisation that created the information.Complexity: The complexity of fault deformation within a fault avoidance zone (for fault avoidance zones only).Base_data: The original dataset that the fault awareness area or fault avoidance zone is based on.Base_scale: The scale at which the fault mapping was originally undertaken.Rept_link: Hyperlink to accompanying report.

Copyright Text: Created by Helen Jack, Environment Canterbury, March 2024, based on individual fault datasets compiled 2004-2024.

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