christchurch earthquake Flashcards
what date was the main earhtquake in christchurch
22 feb 2011
what plate boundary was searthquake on
indo australian and pacific plate boundary
what caused earthquake
strike slip motion on alpine fault
fault unzipped form west to east
why was it hard to predict earthquake
didnt know fault was there and
what scale was earthquake
6.3 richter scale
how deep was focus
5km
where was epicentre
5km south east of CBD
what caused the most damage
aftershocks
how does seismic lensing occur
hard rock on southern alpes and peninsula caused seismic waves to be reflected back
what increased shaking in the city
city built on unconsolidated rock
why was infastructure good and bad
bad = facades made of brick so easily collapsed due to being rigid
good = rest of structures built of wood which flex and bent so withstood the shaking
how many people died
166
what was major cause of damage to buildings
sesimic lensing
how many died due to landslides
5 in port hills region
how many evacuation due to landslides
100’s of houses evacuated
what did flooding cause 2 things
water mains burst and saturated land brought water table close to sunken surface
what caused building to collapse and sink
liquefaction
what is e suburbs built on
400k tonnes of silt
how many aftershocks after inital
200,000
how many properties were damaged
100,000
what was cost of hazard
28bn
what percentage of increase occured in construction servives
59 percent
schools closed
yes
how much of cbd destroyed percentage
50 percent
how big was insurance clain
80bn
how much did suicide rates increase by
5 times
what percentage of people moved out of city
20 percent
what percentgae of people disagreed with governemnt recovery priorities
75 percent
how did they respond medically
built makeshift hospitals and used air ambulance
why was gas shutoff
to prevent gas explosions and fires
how was information passed on
through social media
why was airport left open
for aid, military and volunteers to access area
how many austarlian police came over
300
how much aid was given
6-7 million
what percentage of houses now have earthquake insurance
98 percent
what was other reason for air port reopening to public
boost tourism and rebuild economy
what were the new building regs
hazard map zoning to prevent houses at risk of more liquefaction
why was cera formed (christchurch earthquake recovery centre)
to suspend laws and regulations during earthquake recovery
how many people live in christchurch
300,000 /400,000
how many people left city temporarily
70,000
