canterbury earthquake sequence

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We also fitted the Epidemic Type Aftershock Sequence (ETAS) model to the Canterbury sequence. The authors report on, and summarise, the effects that the 2010-2011 Canterbury earthquake sequence had on the environment. The repair and rebuilding of Canterbury continues and is expected to top $40 billion. Many events in the 2010–2011 Canterbury Earthquake Sequence were sufficiently shallow and close to (or under) Christchurch to subject the city to very intense shaking (V: 1.7 g; H: 2.2 g). In the other dataset there were another couple of examples. Managing the long and complex recovery from the Canterbury earthquake sequence has been a devastating learning curve for the New Zealand government and all its recovery partners. Map showing recent earthquake activity in and around Christchurch, New Zealand. The Canterbury, New Zealand Earthquake Sequence I: The Mw 7.1 Darfield Earthquake of 3 September 2010 and Aftershock Sequence John Ristau GNS Science Lower Hutt, New Zealand Introduction On 4 September 2010 at 04:35 NZST (3 September 16:35 UTC) the moment magnitude (Mw) 7.1 Darfield earthquake occurred in the Canterbury region of New Zealand, … Therefore a new time varying earthquake hazard model, the EE model, was developed. The Canterbury Earthquake Sequence (CES) in 2010-2011 had all the ingredients for causing loss inflation. 15,000 families lost their homes and 8,000 families were permanently displaced. We identified further work required to investigate the applicability of aftershock models on the time-scale of decades, which is due to begin soon. 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. To investigate how unusual late and large aftershocks are (such as those observed in the Canterbury sequence) we used two global earthquake catalogues. Annabel Begg. We fitted the two relationships used in aftershock forecasting, the Omori-Utsu law for aftershock decay and the Gutenberg-Richter relation for the magnitude-frequency distribution of earthquakes, to three subsets of the catalogue following M≥6.0 earthquakes. In the other dataset there were another couple of examples. The Canterbury Earthquake National Memorial was opened to the public at the sixth anniversary commemoration event on 22 February 2017. The memorial is a place to reflect on the 2010/2011 earthquakes that changed Greater Christchurch forever. 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. New papers on paleoseismology, active tectonics and tsunami research. We used the estimated parameters, as well as generic aftershock parameters for New Zealand to simulate ETAS earthquake sequences for the two-year duration of the catalogue, as well as for 50 years starting in September 2012. “On behalf of the Government and all New Zealanders, I would like to thank everyone from Tonkin and Taylor who pitched in and helped in the aftermath of the devastating Canterbury earthquake and continue to assist in the ongoing recovery. 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. 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. The widespread and complex land damage across Canterbury needed to be explained to and understood by property owners. The range of the fitted parameters exceeded what we would have expected from averaging global earthquake sequences. The Earthquake Commission received over 470,000 insurance claims. The 6.3-magnitude earthquake may have been an aftershock of the 7.1-magnitude 4 September 2010 Canterbury earthquake.New Zealand's GNS Science has stated that the earthquake was part of the aftershock sequence that has been occurring since the September magnitude-7.1 quake, however a seismologist from Geoscience Australia considers it a separate event given … He had done his Master’s degree at Canterbury University in earthquake engineering, specifically, liquefaction potential for Christchurch. 185 people lost their lives, over 7000 were injured. 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. 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. 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. The Canterbury earthquake sequence is an on-going earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. 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. Therefore a new time varying earthquake hazard model, called the EE model, was developed. If you'd like to access a paper that doesn't have a download, use the research paper request form to ask for a copy. Search … The most destructive of these was the 22 February 2011 earthquake, centered close to Christchurch, in which 185 people died. YOU NEED JAVASCRIPT TO RUN THIS SITE. 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. How Professionals Have Helped to Prevent Recovery in Canterbury and Have Caused a Separate Disaster for Property Owners Adrian COWIE, New Zealand 1. Many of these research papers have PDF downloads available on the site. 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. 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. The earthquake The first earthquake in September 2010 was the moment the ‘rubber hit the road’ for geotechnical engineer, Mike Jacka. We also identified further work required to better understand what effect the deficiencies of the real-time earthquake data have on the real-time forecasting models. Police and volunteers worked to rescue people after Christchurch's earthquakes in 2011. Tonkin + Taylor’s Virginie Lacrosse found people really “got it” when she likened geotechnical engineers to doctors. More than 650,000 insurance claims … 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 2010 Canterbury earthquake (also known as the Darfield earthquake) struck the South Island of New Zealand with a moment magnitude of 7.1 at 4:35 am local time on 4 September, and had a maximum perceived intensity of X (Extreme) on the Mercalli intensity scale. Latest earthquake is #25940 being magnitude 2.43 ( II) at 33.12 km at 12:10am, about 23 hr 8 mins ago. INTRODUCTION Christchurch, New Zealand. This confirmed that the M≥6.0 aftershocks in the Canterbury sequence occurred relatively far away from the main shock in space and time but this is not too unusual in global aftershock statistics. The Canterbury earthquake sequence is an on-going earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. A primary 380,000) was hit by four major earthquakes and thousands of aftershocks. Some damaging aftershocks followed the main event, the strongest of which was a magnitude 6.3 shock known as the Christchurch earthquakethat occurred nearly six months later on 22 February 2011. For each catalogue we identified magnitude thresholds and time periods for which the data can be expected to be complete. On 4 September 2010, a powerful earthquake struck near Darfield in Canterbury. This disaster has proven that in the worst of times, we see the best of 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 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. 2012) that resulted in 185 fatalities. The tourism industry suffered significant losses as a consequence of the Canterbury earthquake sequence. Half of Christchurch's urban roads had to be rebuilt, 30% of the sewerage system was damaged and 32 million litres of water were lost when a major crack opened up in the floor of the city's largest reservoir. We identified further work required to understand the time frame for which aftershock models can be usefully applied. Kate was on the ground for Tonkin + Taylor mapping land damage and providing critical engineering advice for the Earthquake Commission and NZ Government from the first aftershock. 27 Nov, 2013 6:10pm . Please get in touch. 380,000) was hit by four major earthquakes and thousands of aftershocks. November 3, 2014 | Christoph Grützner in Paper. Earthquake sequence unique to Canterbury . During our project we realised that many earthquakes in the first 24h following Darfield, including 14 in the magnitude band 5‑5.9, had not been reported in the initial GeoNet catalogue. 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. 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 Operations Manager for the Christchurch Earthquake Recovery Project, Shamus Wallace and his wife Lisa had two children after the earthquake sequence began. It began a series of earthquakes and aftershocks lasting till around 2016. As a consequence of the earthquake sequence the A Christophersen, D A Rhoades, S Hainzl, E G C Smith. The Canterbury Earthquake Sequence – Recovery from Disaster. 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. EQC acknowledged several times during this period that the scale … The probability for one or more M≥ 6.0 earthquakes in the 50 years starting in September 2012 ranges from 50% to 93% depending on the model. As a Because … Of these large earthquakes, around 20% had a larger relative distance than Christchurch to Darfield, and around 15% occurred later than 171 days. The Canterbury sequence in the context of global earthquake 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. In our most complete dataset and with the preferred search criteria, 2% of large earthquake fulfil these criteria. Between September 2010 and December 2011, NZ's second largest city (pop. 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. 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. 2 Executive Summary The Christchurch earthquake sequence has been on-going since September 4th 2010. Between September 2010 and December 2011, NZ's second largest city (pop. We identified further work required to better understand what effect the deficiencies of the real-time earthquake data have on the real‑time forecasting models. We slightly changed focus from deriving aftershock parameters from the global catalogue, to modelling aftershocks in the Canterbury sequence to provide bounds for earthquake rates in the Canterbury region for the coming years and decades. 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. 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. EQC received over 470,000 claims, more than 15,000 families lost their homes, and repair costs were estimated at over $40 billion. Canterbury Earthquake Sequence (2010-present) and examines communication learnings to create recommendations for improvements in implementation for these campaigns in future. I would especially like to recognise the dedication of the team on the ground - they are doing a brilliant job. * 10 km east of Waiau, Canterbury, New Zealand. Investigate how unusual late and large aftershocks are as observed in the Canterbury sequence. Canterbury District Health Board (CDHB), Community and Public Health, New Zealand. The report is a literature review of the published material related to the recovery from the Canterbury earthquake sequence, and provides a whole of government perspective on the lessons from the Government’s recovery … Wellbeing recovery inequity following the 2010/2011 Canterbury earthquake sequence: repeated cross‐sectional studies. Greater Christchurch Group has released its Whole of Government report on the lessons from the Canterbury earthquake sequence. All four earthquakes caused lateral spreading to some degree; the most damaging earthquake occurred on 22 February 2011. The research comes from an “insider” perspective from someone who worked on these campaigns in Canterbury before the earthquakes. 2011) and three subsequent earthquakes of Mw ≥ 5.9, most notably the 22 February 2011 Mw6.2 Christchurch earthquake (e.g., Kaiser et al. The Earthquake Commission (EQC) is New Zealand’s public insurer for natural disaster damage. Have a question or feedback? In the early hours of Saturday morning, September 4, 2010 a strong, shallow earthquake struck Christchurch marking the start of the Canterbury Earthquake Sequence (CES). It pays respect to those who lost their lives, those who were seriously injured and survivors. 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. In comparison, the EE model expects about 1.3 M≥6.0 earthquakes in about the same area and time. The expected number ranged from 0.6 to 1.1, and totalled 2.3 for all sub sequences, which is an upper bound estimate due to the dependence of the events. Setting of the Canterbury earthquake sequence. JP Morgan, Chase & Co ranked the CES as the third most costly earthquake event in history behind the 2011 Japanese subduction earthquake/tsunami and the 1994 Californian earthquakes. M C Gerstenberger, GNS Science (EQC funded project 12/634). In summary, the probability for one or more M≥ 6.0 earthquakes in the 50 years starting in September 2012 ranges from 50% to 93% depending on the model and model 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 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 2010–2011 Canterbury earthquake sequence includes the 4 September 2010 Mw7.1 Darfield earthquake (e.g., Gledhill et al. We then searched for earthquake sequences using different search criteria. Investigate how unusual late and large aftershocks are, as observed in the Canterbury sequence. 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. Time-lapse visualisations of the February 22 2011 and September 4 2010 earthquakes and their aftershocks can also be viewed. Since the earthquake, an Engineering Advisory Group has been assembled, now working under the Department of Building and Housing. The Canterbury earthquake sequence has been a long-lived complex earthquake sequence, which started with the M7.1 Darfield earthquake on 4 September 2010. Those shakes, collectively known as the Canterbury earthquake sequence, were the biggest insured event in New Zealand history and at the time the 4 th most expensive insured, global natural disaster to ever occur. Jackson & Arizona are part of the generation of Christchurch children now know as 'the earthquake babies'. To investigate how unusual late and large aftershocks are as observed in the Canterbury sequence, we used two global earthquake catalogues. 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. For each catalogue, we identified magnitude thresholds and time periods for which the data can be expected to be complete. 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