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EQ CASE STUDY: CHRISTCHURCH (PRIMARY EFFECTS (185 people killed (Most due…
EQ CASE STUDY: CHRISTCHURCH
INTRODUCTION
New Zealand is SE of Australia in the Pacific Ocean, Christchurch is a city on the South Island on NZ, Canterbury region
GDP per capita is $27,000 person/year
Population: 4,800,000
Pop. Density: 18 per Km Sq.
NZ experience earthquakes quite regularly, but the last EQ to kill more than 3 people was in 1931. Most are Mag 6+.
PLATE TECHTONIC SETTING
Christchurch sits on a conservative plate margin, with Pacific and Australian Plates moving in opposite directions
EARTHQUAKE DETAILS
Magnitude 6.3 in Feb 22nd 2011 - 1pm
A shallow EQ at 5km deep, 10km west of Christchurch
Previous EQ 6 months earlier had caused damage, but no fatalities
Aftershock of 5.9 mag 2 hours later
PRIMARY EFFECTS
185 people killed
Most due to collapse of 2 office blocks
3,129 injured
Total cost was $40,billion
Liquefaction produced 400,000 tonnes of silt
Buildings weekend by earlier EQ were furthered damed/collapsed due to this one
City's cathedral lost its spire
Hundreds of KM of water pipes damaged
80% of city without electricity
SECONDARY EFFECTS
Businesses out of action = job and income losses
Damage to roads (due to liquefaction) made it hard for emergency services to move around
People affected need support (mentally)
Christchurch could no longer host Rugby 🏉 World Cup, so lost tourism income
Schools had to share classrooms
RESPONSES [LONG AND SHORT RUN]
SHORT
Chemical toilets for 30,000 people
International aid teams came (🇯🇵 ,🇬🇧 ,🇺🇸 )
Australia 🇦🇺 gave AUS$5 million
State of Emergency 🚨 until April 30 2011
LONG
Christchurch dividend into 4 zones to identify land which could be built-in/needed to be checked
Temporary housing given tor residents displaced
By august 50% of footpaths repaired
Canterbury EQ recover Authority created to organise the rebuild. Had special powers.
EXPLANATION OF SEVERITY OF EFFECTS: RISK=H*V/C
NZ is a HIC and is highly developed, meaning they had a high capacity to cope. It already had existing EQ protocol.
Government is very stable, so could disaster plan better and co-ordinate relief