The influence of near-fault motions on liquefaction triggering during the Canterbury earthquake sequence

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dc.contributor.authorCarter, L.
dc.contributor.authorGreen, R.A.
dc.contributor.authorBradley, Brendon
dc.contributor.authorCubrinovski, M.
dc.date.accessioned2014-03-30T20:20:16Z
dc.date.available2014-03-30T20:20:16Z
dc.date.issued2013en
dc.description.abstractThe objective of this study is to examine the influence of near-fault motions on liquefaction triggering in Christchurch and neighboring towns during the 2010-2011 Canterbury earthquake sequence (CES). The CES began with the 4 September 2010, Mw7.1 Darfield earthquake and included up to ten events that triggered liquefaction. However, most notably, widespread liquefaction was induced by the Darfield earthquake and the Mw6.2, 22 February 2011 Christchurch earthquake. Of particular relevance to this study is the forward directivity effects that were prevalent in the motions recorded during the Darfield earthquake, and to a much lesser extent, during the Christchurch earthquake. A 2D variant of the Richart-Newmark fatigue theory was used to compute the equivalent number of cycles (neq) for the ground motions, where volumetric strain was used as the damage metric. This study is unique because it considers the contribution and phasing of both the fault-normal and fault-parallel components of motion on neq and the magnitude scaling factor (MSF). It was found that when the fault-normal and fault-parallel motions were treated individually, the former yielded a lower neq than the latter. Additionally, when the combined effects of fault-normal and fault-parallel components were considered, it was found that the MSF were higher than those commonly used. This implies that motions containing near-fault effects are less demanding on the soil than motions that do not. This may be one of several factors that resulted in less severe liquefaction occurring during the Darfield earthquake than the Christchurch earthquake.en
dc.identifier.citationCarter, L., Green, R.A., Bradley, B.A., Cubrinovski, M. (2013) The influence of near-fault motions on liquefaction triggering during the Canterbury earthquake sequence. Auckland, New Zealand: New Zealand – Japan Workshop on Soil Liquefaction during Recent Large-scale Earthquakes, 2-3 Dec 2013.en
dc.identifier.urihttp://hdl.handle.net/10092/8996
dc.language.isoen
dc.publisherUniversity of Canterbury. Civil and Natural Resources Engineeringen
dc.rights.urihttps://hdl.handle.net/10092/17651en
dc.subjectCanterbury earthquake sequenceen
dc.subjectliquefactionen
dc.subjectnear-faulten
dc.subjectrupture directivityen
dc.subject.anzsrcFields of Research::40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineeringen
dc.titleThe influence of near-fault motions on liquefaction triggering during the Canterbury earthquake sequenceen
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