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Images, eqnz.chch.2010

Photos taken at the Lyttelton Community briefing held on March 7 2011 following the magnitude 6.3 earthquake on 22 February 2011. File Ref: CCL-2011-03-07-Lyttelton-Community-Briefing-P1110621 From the collection of Christchurch City Libraries.

Images, eqnz.chch.2010

Photos taken following the magnitude 6.3 earthquake in Christchurch on 22 February 2011. CCL-2011-02-22-Earthquake-P1110171 We all have earthquake stories to tell — and we’d like to hear yours. Please submit your story on our website, and let us ...

Images, eqnz.chch.2010

Photos taken following the magnitude 6.3 earthquake in Christchurch on 22 February 2011. CCL-2011-02-22-Earthquake-P1110170 We all have earthquake stories to tell — and we’d like to hear yours. Please submit your story on our website, and let us ...

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

The quake-damaged facade of the Baptist Church at the Kilmore Street / Madras Street intersection being propped up while repairs are in progress.

Images, eqnz.chch.2010

Time stands still on the Science Museum clock tower as a poignant reminder of the moment the trembler struck Christchurch in the early hours of Saturday 4 September 2010.

Images, eqnz.chch.2010

Photos taken following the magnitude 6.3 earthquake in Christchurch on 22 February 2011. File ref: CCL-2011-02-22-Earthquake-P1110168 We all have earthquake stories to tell — and we’d like to hear yours. Please submit your story on our website, a...

Images, eqnz.chch.2010

Hotel Grand Chancellor on verge of collapse but still standing after the 6.3 magnitude quake hit Christchurch on 22 February 2011 because of concrete being poured into the lower floors.

Images, eqnz.chch.2010

Broken head-stones as a result of the magnitude 6.3 quake in Christchurch - 22 February 2011. HDR process to add the "feeling" I felt at seeing this sort of damage.

Research papers, University of Canterbury Library

High-quality ground motion records are required for engineering applications including response history analysis, seismic hazard development, and validation of physics-based ground motion simulations. However, the determination of whether a ground motion record is high-quality is poorly handled by automation with mathematical functions and can become prohibitive if done manually. Machine learning applications are well-suited to this problem, and a previous feed-forward neural network was developed (Bellagamba et al. 2019) to determine high-quality records from small crustal events in the Canterbury and Wellington regions for simulation validation. This prior work was however limited by the omission of moderate-to-large magnitude events and those from other tectonic environments, as well as a lack of explicit determination of the minimum usable frequency of the ground motion. To address these shortcomings, an updated neural network was developed to predict the quality of ground motion records for all magnitudes and all tectonic sources—active shallow crustal, subduction intraslab, and subduction interface—in New Zealand. The predictive performance of the previous feed-forward neural network was matched by the neural network in the domain of small crustal records, and this level of predictive performance is now extended to all source magnitudes and types in New Zealand making the neural network applicable to global ground motion databases. Furthermore, the neural network provides quality and minimum usable frequency predictions for each of the three orthogonal components of a record which may then be mapped into a binary quality decision or otherwise applied as desired. This framework provides flexibility for the end user to predict high-quality records with various acceptability thresholds allowing for this neural network to be used in a range of applications.

Audio, Radio New Zealand

Christchurch Mayor Bob Parker, New standards for earthquake prone buildings in Christchurch, Some schools reopen, while others face permanent closure, PM says Defence Force's role to check CV, Plans to burn the Koran on hold not cancelled, Chances of magnitude aftershock hitting rapidly decreasing.