Jennifer Middendorf's Blog 04/09/2014: Four
Articles, UC QuakeStudies
An entry from Jennifer Middendorf's blog for 4 September 2014 entitled, "Four".
An entry from Jennifer Middendorf's blog for 4 September 2014 entitled, "Four".
An entry from Jennifer Middendorf's blog for 7 January 2012 entitled, "Yesterday".
The region in and around Christchurch, encompassing Christchurch city and the Selwyn and Waimakariri districts, contains more than 800 road, rail, and pedestrian bridges. Most of these bridges are reinforced concrete, symmetric, and have small to moderate spans (15–25 m). The 22 February 2011 moment magnitude (Mw) 6.2 Christchurch earthquake induced high levels of localized ground shaking (Bradley and Cubrinovski 2011, page 853 of this issue; Guidotti et al. 2011, page 767 of this issue; Smyrou et al. 2011, page 882 of this issue), with damage to bridges mainly confined to the central and eastern parts of Christchurch. Liquefaction was evident over much of this part of the city, with lateral spreading affecting bridges spanning both the Avon and Heathcote rivers.
A story submitted by Michael to the QuakeStories website.
Transcript of David Penney's earthquake story, captured by the UC QuakeBox project.
An entry from Jennifer Middendorf's blog for 3 September 2013 entitled, "Three".
A story submitted by Rosie Belton to the QuakeStories website.
An entry from Jennifer Middendorf's blog for 8 February 2013 entitled, "Vote for me!".
A story submitted by Brenda Greene to the QuakeStories website.
A story submitted by Joanna Orwin to the QuakeStories website.
Transcript of Bud Chapman's earthquake story, captured by the UC QuakeBox project.
A video recording of a lecture presented by Professor Jarg Pettinga and Dr Mark Quigley as part of the 2011 University of Canterbury Earthquake Lecture Series.
Transcript of Harry Kitkevics's earthquake story, captured by the UC QuakeBox project.
Transcript of Owen Macintyre's earthquake story, captured by the UC QuakeBox project.
A copy of the CanCERN online newsletter published on 11 May 2012
Summary of oral history interview with Lianne Dalziel about her experiences of the Canterbury earthquakes.
A copy of the CanCERN online newsletter published on 2 November 2012
Transcript of Laurie Hill's earthquake story, captured by the UC QuakeBox project.
Transcript of Sherrilee's earthquake story, captured by the UC QuakeBox project.
Summary of oral history interview with Susan Allen about her experiences of the Canterbury earthquakes.
A pdf transcript of Participant number LY677's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Samuel Hope. Transcriber: Josie Hepburn.
A pdf transcript of Participant Number LY191's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Joshua Black. Transcriber: Caleb Middendorf.
A pdf transcript of Part 1 of Tracey Waiariki's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Lucy Denham. Transcriber: Lucy Denham.
A pdf transcript of Rosie Belton's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Laura Moir. Transcriber: Josie Hepburn.
A pdf transcript of Stephen Bourke's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Lucy Denham. Transcriber: Lucy Denham.
A pdf transcript of Chris's second earthquake story, captured by the UC QuakeBox Take 2 project. Interviewer: Joshua Black. Transcriber: Caleb Middendorf.
The 2011, 6.3 magnitude Christchurch earthquake in New Zealand caused considerable structural damage. It is believed that this event has now resulted in demolition of about 65-70% of the building stock in the Central Business District (CBD), significantly crippling economic activities in the city of Christchurch. A major concern raised from this event was adequacy of the current seismic design practice adopted for reinforced concrete walls due to their poor performance in modern buildings. The relatively short-duration earthquake motion implied that the observed wall damage occurred in a brittle manner despite adopting a ductile design philosophy. This paper presents the lessons learned from the observed wall damage in the context of current state of knowledge in the following areas: concentrating longitudinal reinforcement in wall end regions; determining wall thickness to prevent out-of-plane wall buckling; avoiding lap splices in plastic hinge zones; and quantifying minimum vertical reinforcement. http://www.2eceesistanbul.org/
Measurement of basement seismic resonance frequencies can elucidate shallow velocity structure, an important factor in earthquake hazard estimation. Ambient noise cross correlation, which is well-suited to studying shallow earth structure, is commonly used to analyze fundamental-mode Rayleigh waves and, increasingly, Love waves. Here we show via multicomponent ambient noise cross correlation that the basement resonance frequency in the Canterbury region of New Zealand can be straightforwardly determined based on the horizontal to vertical amplitude ratio (H/V ratio) of the first higher-mode Rayleigh waves. At periods of 1-3 s, the first higher-mode is evident on the radial-radial cross-correlation functions but almost absent in the vertical-vertical cross-correlation functions, implying longitudinal motion and a high H/V ratio. A one-dimensional regional velocity model incorporating a ~ 1.5 km-thick sedimentary layer fits both the observed H/V ratio and Rayleigh wave group velocity. Similar analysis may enable resonance characteristics of other sedimentary basins to be determined. © 2013. American Geophysical Union. All Rights Reserved.
This study explores the role and value of urban community gardens following a major crisis: the 2010/11 earthquakes in Christchurch, New Zealand.
This paper presents on-going challenges in the present paradigm shift of earthquakeinduced ground motion prediction from empirical to physics-based simulation methods. The 2010-2011 Canterbury and 2016 Kaikoura earthquakes are used to illustrate the predictive potential of the different methods. On-going efforts on simulation validation and theoretical developments are then presented, as well as the demands associated with the need for explicit consideration of modelling uncertainties. Finally, discussion is also given to the tools and databases needed for the efficient utilization of simulated ground motions both in specific engineering projects as well as for near-real-time impact assessment.