Preliminary insights into the fault geometries and kinematics of surface rupture along the South Leader Fault during the Mw 7.8 Kaikoura earthquake

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dc.contributor.authorHyland N
dc.contributor.authorNicol A
dc.contributor.authorFenton CH
dc.contributor.authorKhajavi N
dc.contributor.authorPettinga J
dc.contributor.authorBushell T
dc.date.accessioned2018-07-24T00:25:25Z
dc.date.available2018-07-24T00:25:25Z
dc.date.issued2017en
dc.date.updated2018-05-18T04:01:33Z
dc.description.abstractThe south Leader Fault (SLF) is a newly documented active structure that ruptured the surface during the Mw 7.8 Kaikoura earthquake. The Leader Fault is a NNE trending oblique left lateral thrust that links the predominantly right lateral ‘The Humps’ and Conway-Charwell faults. The present research uses LiDAR at 0.5 m resolution and field mapping to determine the factors controlling the surface geometries and kinematics of the south Leader Fault ruptures at the ground surface. The SLF zone is up to 2km wide and comprises a series of echelon NE-striking thrusts linked by near-vertical N-S striking faults. The thrusts are upthrown to the west by up to 1 m and dip 35-45°. Thrust slip surfaces are parallel with Cretaceous-Cenozoic bedding and may reflect flexural slip folding. By contrast, the northerly striking faults dip steeply (65° west- 85° east), and accommodate up to 3m of oblique left lateral displacement at the ground surface and displace Cenozoic bedding. Some of the SLF has been mapped in bedrock, although none were known to be active prior to the earthquake or have a strong topographic expression. The complexity of fault rupture and the width of the fault zone appears to reflect the occurrence of faulting and folding at the ground surface during the earthquake.en
dc.identifier.urihttp://hdl.handle.net/10092/15695
dc.language.isoen
dc.subjectKaikoura Earthquakeen
dc.subjectNorth Canterburyen
dc.subjectFault Kinematicsen
dc.subjectFault Geometriesen
dc.subjectTranspressive Structuresen
dc.subject.anzsrcFields of Research::37 - Earth sciences::3706 - Geophysics::370609 - Seismology and seismic explorationen
dc.subject.anzsrcField of Research::04 - Earth Sciences::0403 - Geology::040313 - Tectonicsen
dc.subject.anzsrcField of Research::04 - Earth Sciences::0403 - Geology::040312 - Structural Geologyen
dc.titlePreliminary insights into the fault geometries and kinematics of surface rupture along the South Leader Fault during the Mw 7.8 Kaikoura earthquakeen
dc.typeConference Contributions - Publisheden
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