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Canterbury Earthquake Sequence and itsImpactsDavid JohnstonJoint Centre for Disaster Research,GNS Science – Massey Univers...
Christchurch      Earthquake      epicentre                   GNS Science
GNS Science
Central business district                            GNS Science
GNS Science
A tale of two earthquakes – the Canterbury sequence                     of 2010-2011                                      ...
GNS Science
Feb. & June 2011    Sept. 2010    Earthquake comparison                         •   M6.2 & M6.0 within 5 km of the city   ...
CTV Building               9   GNS Science
GNS Science
Community & Public Health76 Chester St East                            GNS Science
International Support• Urban Search and Rescue (USAR)   –   NZ Fire Service: 150 personnel   –   International Teams: 439 ...
RESOURCING•   2500 Port a loos (960 flown from America)•   40,000 chemical toilets•   31 KMS of security fencing•   18 “su...
14GNS Science
15GNS Science
Spontaneous Volunteers• Social Media used to harness student  population• Student Army• Farmy Army• Informal groups assist...
Situation at end of State of Emergency1 May 2011•   Fatalities:       185 confirmed (2011)•   Injuries:         ACC: ~2500...
Five most common types of injuries 4th September 2010       Soft Tissue Injury                 74.1% (1671)       Lacerati...
Mechanism of injury                       4th September 2010   22nd February 2011Primary Immediate            377      16....
GNS Science
Injury prevention• Improved building codes, strengthening  buildings and securing fittings will reduce future  earthquake ...
Drinking water and sewerage• Initial priority to make       drinking water safe:   –   Drinking water assessors   –   Chri...
E.Coli transgression clusters                                GNS Science
Why no gastro outbreaks?• Cantabrians still boiling water  at 6 weeks   –   Telephone survey• Scrupulous handwashing:   – ...
Winter Heating•   Approx 13,000 homes lost primary    heat source•   Winter Heating Group•   Fletchers Winter Heat Project...
Social and psychosocial impacts                            GNS Science
Intervention pyramidIntervention pyramid for mentalhealth and psychosocial support inemergencies & long termprogrammes    ...
Wellbeing•   Connectedness•   Normalising reactions•   Avoiding “PTSD”•   Consistent messages•   Evidence-based    service...
Where have all the people gone?                                  GNS Science
Moving to the future              GNS Science
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Canterbury Earthquake Sequence and its Impacts - Davis Johnston

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2013 EERI Annual Meeting Session: Christchurch Earthquakes Workshop

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Canterbury Earthquake Sequence and its Impacts - Davis Johnston

  1. 1. Canterbury Earthquake Sequence and itsImpactsDavid JohnstonJoint Centre for Disaster Research,GNS Science – Massey University, Wellington, New Zealand GNS Science
  2. 2. Christchurch Earthquake epicentre GNS Science
  3. 3. GNS Science
  4. 4. Central business district GNS Science
  5. 5. GNS Science
  6. 6. A tale of two earthquakes – the Canterbury sequence of 2010-2011 GNS Science
  7. 7. GNS Science
  8. 8. Feb. & June 2011 Sept. 2010 Earthquake comparison • M6.2 & M6.0 within 5 km of the city • Both occurred in the afternoon• M7.1 earthquake, 30 km west of city • 185 fatalities, scores of serious injuries• Saturday 4th September at 4:36 am • Damage & deaths in the CBD in older brick,• 0 fatalities, only 2 serious injuries URM and a few commercial buildings built• Damage to older brick and URM prior to modern code • Modern code buildings generally• Residential damage due to liquefaction and performed very well under extreme loads lateral spreading • Widespread residential damage resulting• Cost: Estimate of $4-5 billion (direct) from liquefaction and shaking (> 1 g PGA)• Psychological and business impacts on • Cost: Estimate of $ 20+ billion community despite no loss of life • Most significant socio-economic event in NZ since 60 years – 8-10% GDP GNS Science
  9. 9. CTV Building 9 GNS Science
  10. 10. GNS Science
  11. 11. Community & Public Health76 Chester St East GNS Science
  12. 12. International Support• Urban Search and Rescue (USAR) – NZ Fire Service: 150 personnel – International Teams: 439 personnel from 7 countries (Australia, US, UK, Japan, China, Taiwan, Singapore) – NZ Response Teams (19 teams approx 160 personnel)• Disaster Victim Identification: 40 staff from 5 countries• Police: 353 Australian Police• Engineering, Medical, Military, GNS Science
  13. 13. RESOURCING• 2500 Port a loos (960 flown from America)• 40,000 chemical toilets• 31 KMS of security fencing• 18 “sucker trucks” (sourced from Aussie)• CDEM staff from throughout the country assisting in both the Christchurch EOC and the NCMC GNS Science
  14. 14. 14GNS Science
  15. 15. 15GNS Science
  16. 16. Spontaneous Volunteers• Social Media used to harness student population• Student Army• Farmy Army• Informal groups assisting GNS Science
  17. 17. Situation at end of State of Emergency1 May 2011• Fatalities: 185 confirmed (2011)• Injuries: ACC: ~2500 (2010) and ~7500 (2011)• Power: 100% restored outside CBD ‘red zone’• Water: 100% have mains supply outside red zone• Waste water: 97% of city with working toilets• Schools: All open (11 sharing facilities)• Health: All services within capacity• Buildings: About 20% commercial unsafe• Homes: About 26000 vacant houses. 2% unsafe• Insurance: Over 340 000 claims so far (Sept-Feb)• Estimated Economic Costs NZ$15-20 billion (c. 9% of GDP) GNS Science
  18. 18. Five most common types of injuries 4th September 2010 Soft Tissue Injury 74.1% (1671) Lacerations, punctures, stings 12.3% (277) Fracture/dislocation 5.3% (120) Dental Injury 2.3% (53) Other 1.3% (30)Five most common types of injuries 22nd February 2011 Soft Tissue Injury 70.44% (5051) Lacerations, punctures, stings 15.37% (1102) Fracture/dislocation 6.62% (475) Dental Injury 1.77% (127) Other 1.53% (110) GNS Science
  19. 19. Mechanism of injury 4th September 2010 22nd February 2011Primary Immediate 377 16.7% 3129 43.6%Primary Action 1025 45.4% 1293 18.0%Primary Unknown 50 2.2% 574 8.0%Secondary (includingcleanup) 499 22.1% 1881 26.2%Aftershock Immediate 165 7.3% 172 2.4%Aftershock Action 134 5.9% 103 1.4%Aftershock Unknown 6 0.3% 19 0.3% GNS Science
  20. 20. GNS Science
  21. 21. Injury prevention• Improved building codes, strengthening buildings and securing fittings will reduce future earthquake deaths and injuries.• However, the high rate of action injuries earthquake suggests that further education is needed to promote appropriate actions during and after earthquakes. GNS Science
  22. 22. Drinking water and sewerage• Initial priority to make drinking water safe: – Drinking water assessors – Christchurch City council – NZ Defence Force• Chlorination: – Initially slow progress – C&PH assisted with GIS data – De-chlorination now complete GNS Science
  23. 23. E.Coli transgression clusters GNS Science
  24. 24. Why no gastro outbreaks?• Cantabrians still boiling water at 6 weeks – Telephone survey• Scrupulous handwashing: – Pandemic preparedness? – Sterigel• Excellent communication – Community briefings – Websites – Print media GNS Science
  25. 25. Winter Heating• Approx 13,000 homes lost primary heat source• Winter Heating Group• Fletchers Winter Heat Project – Prioritisation – collated EQC/MSD/PHO data – Slow start, rapid escalation – No insulation• De facto clean heat but – Emergency preparedness – Unflued gas heaters GNS Science
  26. 26. Social and psychosocial impacts GNS Science
  27. 27. Intervention pyramidIntervention pyramid for mentalhealth and psychosocial support inemergencies & long termprogrammes GNS Science
  28. 28. Wellbeing• Connectedness• Normalising reactions• Avoiding “PTSD”• Consistent messages• Evidence-based services for those with ongoing issues. GNS Science
  29. 29. Where have all the people gone? GNS Science
  30. 30. Moving to the future GNS Science

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