Recurrent liquefaction in Christchurch, New Zealand, during the Canterbury earthquake sequence

Abstract

Research Article| April 01, 2013 Recurrent liquefaction in Christchurch, New Zealand, during the Canterbury earthquake sequence Mark C. Quigley; Mark C. Quigley 1Department of Geological Sciences, University of Canterbury, Christchurch 8014, New Zealand Search for other works by this author on: GSW Google Scholar Sarah Bastin; Sarah Bastin 1Department of Geological Sciences, University of Canterbury, Christchurch 8014, New Zealand Search for other works by this author on: GSW Google Scholar Brendon A. Bradley Brendon A. Bradley 2Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch 8014, New Zealand Search for other works by this author on: GSW Google Scholar Geology (2013) 41 (4): 419–422. https://doi.org/10.1130/G33944.1 Article history received: 13 Aug 2012 rev-recd: 16 Oct 2012 accepted: 17 Oct 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mark C. Quigley, Sarah Bastin, Brendon A. Bradley; Recurrent liquefaction in Christchurch, New Zealand, during the Canterbury earthquake sequence. Geology 2013;; 41 (4): 419–422. doi: https://doi.org/10.1130/G33944.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Continuous observational monitoring of a study site in eastern Christchurch, New Zealand, following the 2010 Mw 7.1 Darfield earthquake has recorded ten distinct liquefaction episodes in the mainshock–aftershock sequence. Three nearby accelerometers allow calibration between the geological expressions of liquefaction and the intensity of earthquake-induced surface ground motion at the site. Sand blow formation was generated by Mw 5.2–7.1 earthquakes with Mw 7.5–normalized peak ground accelerations (PGA7.5) of ≥ 0.057 g (acceleration due to gravity). Silt drapes between successive sand blow deposits provide markers for delineating distinct liquefaction-inducing earthquakes in the geologic record. However, erosion quickly modifies the surface of sand blows into alluvial and aeolian forms that complicate geologic diagnosis. The two feeder-dike generations identified in subsurface investigations significantly underrepresent the number of liquefaction-inducing earthquakes due to extensive dike reactivation. New constitutive equations enable PGA7.5 variations to be estimated from the thickness and areal extent of sand blows. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.