Name: Fault Awareness Overlay

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Description: While the Waimakariri District Council has taken all reasonable care in providing correct information, all information should be considered as being illustrative and indicative only. Your use of this information is entirely at your own risk. You should independently verify the accuracy of any information before taking any action in reliance upon it.Read the full disclaimer here.A full description is available in the Metadata. Abstract:Suggested fault hazard (important infrastructure or facilities) overlay for the Waimakariri District Plan, May 2020.The suggested Waimakariri fault hazard (important infrastructure or facilities) overlay comprises all fault awareness areas in Waimakariri from the Canterbury fault awareness areas 2019 dataset, as recommended in Barrell, et al, 2015, Guidelines for using regional-scale earthquake fault information in Canterbury. GNS Science Consultancy Report 2014/211. See this report, and the metadata for the Canterbury fault awareness areas 2019 dataset, for more detail on how the fault awareness areas were delineated.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.The suggested Waimakariri fault hazard (important infrastructure or facilities) overlay is where the fault rupture hazard should be specifically considered and the fault rupture deformation areas mapped as part of a consent for important or critical infrastructure or facilities (as defined in the Waimakariri District Plan).Descriptions of the attribute fields:Name: Fault name, taken from the district fault name field (e.g. WDC_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 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. 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).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.Other technical fields, such accuracy, sense of movement, dip direction, down quadrant, trend and facing, as well as territorial authority (all Waimakariri) have been removed for simplicity but this information can be found in the Canterbury fault awareness areas 2019 dataset.Update Frequency:As needed.Point of Contact:Waimakariri District Council.Lineage: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, recognizing 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, recognizing that 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.

Copyright Text: Created by Helen Jack, Environment Canterbury, May 2020, based on the Canterbury Fault Awareness Area 2019 dataset.

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