canterbury earthquake sequence

Search … Investigate how unusual late and large aftershocks are as observed in the Canterbury sequence. The widespread and complex land damage across Canterbury needed to be explained to and understood by property owners. Canterbury District Health Board (CDHB), Community and Public Health, New Zealand. Our project set out to investigate the Canterbury sequence in the context of global earthquake statistics. The three M≥6.0 aftershocks included the devastating M6.3 Christchurch earthquake on 22 February 2011, which resulted in 185 deaths and extensive damage. The tourism industry suffered significant losses as a consequence of the Canterbury earthquake sequence. The first earthquake in September 2010 was the moment the ‘rubber hit the road’ for geotechnical engineer, Mike Jacka. YOU NEED JAVASCRIPT TO RUN THIS SITE. Police and volunteers worked to rescue people after Christchurch's earthquakes in 2011. During our project we realised that many earthquakes, including 14 in the magnitude band 5‑5.9 in the first 24h following Darfield, had not been reported in the initial GeoNet catalogue. M C Gerstenberger, GNS Science (EQC funded project 12/634). Jackson & Arizona are part of the generation of Christchurch children now know as 'the earthquake babies'. The sequence began in September 2010, followed by a significant aftershock in February 2011 that caused an unprecedented and sustained reduction in tourism arrivals to the city of Christchurch and the wider region. We then searched for earthquake sequences using different search criteria. Wellbeing recovery inequity following the 2010/2011 Canterbury earthquake sequence: repeated cross‐sectional studies. 380,000) was hit by four major earthquakes and thousands of aftershocks. As a Many of these research papers have PDF downloads available on the site. PLEASE ENABLE JAVASCRIPT IN YOUR INTERNET OPTIONS. Have a question or feedback? We had two main objectives: Use aftershock parameters derived from global earthquake catalogues to provide bounds for earthquake rates in the Canterbury region for the coming years and decades. For the prospective simulations the expected number of M≥ 6.0 earthquakes in 50 years is up to six times higher than for the EE model. The Canterbury Earthquake Sequence (2010 – 2011) caused significant damage and loss of life in Christchurch, New Zealand. The first earthquake occurred at the beginning of the New Zealand spring in September 2010 (when building projects typically start) followed by three more A Christophersen, D A Rhoades, S Hainzl, E G C Smith. CANTERBURY EARTHQUAKE SEQUENCE Since the M w7.1 earthquake occurred on 4 September 2010, a sequence of significant earthquakes has struck the greater Christchurch region, as summarised in Table 1. Depending on the search criteria, between 6 and 13 % of main shocks in the more complete catalogue had 3 or more aftershocks within 1.1 magnitude units as observed in the Canterbury sequence. Due to on-going aftershock activity and the possibility of other triggered moderate to large earthquakes, the New Zealand National Seismic Hazard model was expected to grossly underestimate the level of ground shaking for the Canterbury region for the coming decades. Of these large earthquakes, around 20% had a larger relative distance than Christchurch to Darfield, and around 15% occurred later than 171 days. 2011) and three subsequent earthquakes of Mw ≥ 5.9, most notably the 22 February 2011 Mw6.2 Christchurch earthquake (e.g., Kaiser et al. EQC received over 470,000 claims, more than 15,000 families lost their homes, and repair costs were estimated at over $40 billion. The Earthquake Commission (EQC) is New Zealand’s public insurer for natural disaster damage. The Canterbury earthquake sequence has been a long-lived complex earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. EARTHQUAKE SEQUENCE A magnitude7.1 earthquake struck the Canterbury region of New Zealands South Island on September 4, 2010; the epicenter was located near the town of Darfield, approximately 35 kilometers west of Christchurch on the previously unknown Greendale fault. Tonkin + Taylor's Canterbury Earthquake Recovery Programme Leader, John Leeves and liquefaction expert, Dr Sjoerd van Ballegooy reflect on the unprecedented liquefaction damage that devastated Greater Christchurch. * 10 km east of Waiau, Canterbury, New Zealand. 4 minutes to read . In the other dataset there were another couple of examples. 185 people lost their lives, over 7000 were injured. All four earthquakes caused lateral spreading to some degree; the most damaging earthquake occurred on 22 February 2011. This confirms that while the Christchurch earthquake occurred with a time delay of 171 days and 42 km from the Darfield epicentre, this is not too unusual in global earthquake occurrences. Earthquake sequence unique to Canterbury . In our most complete dataset and with the preferred search criteria, 2% of large earthquake fulfil these criteria. How Professionals Have Helped to Prevent Recovery in Canterbury and Have Caused a Separate Disaster for Property Owners Adrian COWIE, New Zealand 1. In comparison, the EE model expects about 1.3 M≥6.0 earthquakes in about the same area and time. 15,000 families lost their homes and 8,000 families were permanently displaced. The repair and rebuilding of Canterbury continues and is expected to top $40 billion. Between September 2010 and December 2011, NZ's second largest city (pop. The Canterbury earthquake sequence is an on-going earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. Please get in touch. The 2010–2011 Canterbury earthquake sequence includes the 4 September 2010 Mw7.1 Darfield earthquake (e.g., Gledhill et al. We slightly changed focus from deriving aftershock parameters from the global catalogue, to aftershock modelling in the Canterbury sequence to provide bounds for earthquake rates in the Canterbury region for the coming years and decades. 1 earthquake within a radius of 150km of central Christchurch over 24 hours. Photo / Christchurch Star We used the fitted parameters to calculate the number of M≥6.0 earthquakes expected to occur in the 50 years starting in September 2012 for the different combinations of parameters. The lines indicate the main fault models used in this paper and the beach balls are the first motion focal mechanisms recorded for each earthquake. The Canterbury earthquake sequence is an on-going earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. In the final analysis, it became clear that the most widespread and severe affects to infrastructure and land had been caused by repeated liquefaction events and the damage each one induced when millions of tonnes of silt and water spewed to the earth's surface. The three M≥6.0 aftershocks included the devastating M6.3 Christchurch earthquake on 22 February 2011, which resulted in 185 deaths and extensive damage. For Kate, there's one clear, key lesson to learn from the Christchurch earthquakes. Earthquake sequence unique to Canterbury 27 Nov, 2013 05:10 AM 4 minutes to read Police and volunteers worked to rescue people after Christchurch's earthquakes in 2011. In the other dataset there were another couple of examples. For each catalogue, we identified magnitude thresholds and time periods for which the data can be expected to be complete. More than 650,000 insurance claims … Since the earthquake, an Engineering Advisory Group has been assembled, now working under the Department of Building and Housing. The largest two earthquakes, magnitude (M) 7.1 on September 4th and the M 6.3 on February 22nd 2011 caused immediate and significant damage to the city of Christchurch. The 2010–2011 Canterbury Earthquake Sequence (CES), including the moment magnitude (M w) 7.1 Darfield earthquake and M w 6.2, 6.0, 5.9, and 5.8 aftershocks, occurred on a suite of previously unidentified, primarily blind, active faults in the eastern South Island of New Zealand. All of the earthquakes occurred on previously We first illustrated the deficiency of the initial catalogue by comparing the GeoNet data downloaded in January 2012 with the mainly finalised catalogue in September 2012. The Canterbury earthquake sequence has caused severe damage through much of the city, both in the residential areas comprising mostly the eastern suburbs, and also in the CBD. 380,000) was hit by four major earthquakes and thousands of aftershocks. We also searched for large aftershocks within 1.1 magnitude units of the main shock that occurred at least as late and far away as the Christchurch earthquake relative to the Darfield earthquake. A primary In space, the relative distance of Christchurch to the Darfield earthquakes was around the 80th percentile, and in time around the 85th percentile of all large aftershocks respective to their main shocks for the preferred search criteria. The earthquake This confirmed that although the M≥6.0 aftershocks in the Canterbury sequence occurred relatively far away from the main shock in space and time these differences were not unusual in global aftershock statistics. Depending on the search criteria, between 6 and 13 % of main shocks in the more complete catalogue had 3 or more aftershocks within 1.1 magnitude units, as observed in the Canterbury sequence. The memorial is a place to reflect on the 2010/2011 earthquakes that changed Greater Christchurch forever. We identified further work required to understand the time frame for which aftershock models can be usefully applied. In our best dataset, 2% of large earthquake fulfil these criteria. There was limited experience in dealing with the complexities of such an … The range of the fitted parameters exceeded what we would have expected from averaging global earthquake sequences. He had done his Master’s degree at Canterbury University in earthquake engineering, specifically, liquefaction potential for Christchurch. The Pegasus Bay aftershock sequence is the most recent aftershock sequence of the 2010 September 3 UTC moment magnitude (M w) 7.1 Darfield earthquake in the Canterbury region of New Zealand.The Pegasus Bay aftershock sequence began on 2011 December 23 UTC with three events of M w 5.4–5.9 located in the offshore region of Pegasus … The three M≥6.0 aftershocks included the devastating M6.3 Christchurch earthquake on 22 February 2011, which resulted in 185 deaths and extensive damage. It pays respect to those who lost their lives, those who were seriously injured and survivors. 6.3 magnitude earthquake part of aftershock sequence February the 22nd's devastating magnitude 6.3 earthquake centred southeast of Christchurch was part of the aftershock sequence that has been occurring since the September magnitude 7.1 quake near Darfield, 40km west of the city, an earthquake geologist said today. 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