Name: Canterbury Fault Awareness Areas 2019

Display Field: Name

Type: Feature Layer

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Description: The fault awareness areas show 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 movement on the fault. It is different from earthquake shaking.This dataset has been compiled from individual district fault datasetsand reportsdeveloped for Environment Canterbury by GNS Science between 2009 and 2017: Kaikoura (2015), Hurunui (2012), Waimakariri (2013), 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.This dataset does not include mapped fault ruptures from the 2016 Kaikoura earthquake (where the fault was not previously mapped). The dataset will be updated in the coming years with the mapped fault ruptures.More detailed mapping has been undertaken for the Hope Fault (Mt Lyford), Hanmer Fault (Hanmer Springs), Ashley Fault (Ashley), Greendale Fault (Selwyn District) and the Ostler Fault (Twizel). These more detailed datasets should be used in these areas.Descriptions of the attribute fields:Name: Fault name, taken from the district fault name field (e.g. KDC_name) in the district fault datasets. Some of these have been changed from the original district fault names to make them consistent with what is given in the district fault report.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.Max RI:Maximum fault recurrence interval, taken from the summary table of each district fault report.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. Some values have been changed to better match the minimum fault recurrene 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. Type:Whether the mapped feature is a fault (fault reaches the ground surface) or a monocline (fault stops below the ground surface but forms a fold in the ground surface).Accuracy:Accuracy of the mapped line - accurate, approximate, concealed, or inferred. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.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.Dip dir:Compass direction of the dip on the fault. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.Dip:Angle of dip of fault from horizontal. 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.Trend:Compass direction of the fold axis. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.Facing:Compass direction of fold younging. Kept from the 1:250,000 GNS Science QMAP series fault attributes, where given.District:District that fault is within.Buffer m:Whether a 125m or 250m buffer has been applied to the fault to create the fault awareness area as per Barrell, et al, 2015.

Copyright Text: Created by Helen Jack, Environment Canterbury, February 2018, based on individual district fault datasets compiled 2009-2017.

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Spatial Reference: 2193  (2193)

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