Tectonics - Earthquakes
Case Studies
- Created by: Ella
- Created on: 26-04-11 13:37
Loma Prieta (USA)
Date: 1989 (October 17th)
Magnitude: 7.1 (M5.2 aftershock)
Time: 5:04 pm
Death toll: 62
Facts:
- 12,000 homeless and 3757 injured
- $6-10 billion damage
- The epicentre - Santa Cruz Mountains (100km south of San Francisco)
- Marina District - suffered liquifaction and lateral spreading (because it was reclaimed marshland lagoon)
- The Cypress Structure collapsed killing 42 and injuring 400.
Northridge, California
Date: 1994 (January 17th)
Magnitude: 6.7
Time: 04:31 am (slightly better as people were off roads etc)
Death toll: 57
Facts:
- Quake occured on a blind thrust fault
- 11,000 homes, 250 gas lines + 9 highway over passes destroyed
- 90,000 buildings in LA inspected after quake, with only 2% deemed unsafe to enter and 88% safe (others were partial access)
- ^ this is because of well recieved building codes and stringent regulations, particularly on public buildings e.g schools + hospitals
Kobe, Japan
Date: 1995 (January 17th)
Magnitude: 6.8
Time: 05:46 am
Death toll: 6,000
Facts:
- $150 billion damage
- 4,900 people died in traditional houses (these have lightweigh, open structures and heavy tiled roofs to help withstand typhoons etc)
- worst impact on the dock area as it was reclaimed from the sea and suffered liquifaction - $6.8 billion spent rebuilding here
- Quake travelled 15km from epicentre and there was an unknown fault under Kobe.
- Japan introduced the national disaster strategy afterwards
Spitak, Armenia
Date: 1988 (December 7th)
Magnitude: 6.9
Time: 11:41 am (which made it worse as people were at work, school and so on)
Death toll: 25,000
Facts:
- $3 billion damage
- quake was way more damaging than it should have been
- 70% of Soviet buildings were destroyed
- 100,000 still living in "temporary shelters" (metal crates) 9 years later
- 14 years later 12,000 families still in "temporary" housing
- a lot of US aid given, but people weren't seeing the benefits
Irpinia, Southern Italy
Date: 1980
Magnitude: 6.9
Time: 7:35 pm
Death toll: 3,000
Facts:
- 143 villages were affected by the quake - but 1 year on 687 were affected (claimed for damage)
- People still live in the iron 'prefabs' - temporary shelter
- $30 billion was spent but only $26 million accounted for
- large amounts of corruption and the involvement of the Camorra
- Laviano - completely destroyed but only recieved 1 million whilst;
- Bisaccia - not damaged at all recieved 83 million + 6 billion went on a church
L'Aquila, Italy
Date: 2009 (April 6th)
Magnitude: 6.3
Time: 3:32 am (could have been worse had it been church or working time)
Death toll: 308
Facts:
- population of 72,800 - it's a university city
- 44,000 left homeless
- ages 20 - 29 and 70+ were the dominant death groups
- 1/5 of the deaths occured in only 7 buildings
- $16 billion damage
- reinforced concrete didn't move well + columns collapsed
- old and religious buildings badly damaged
Kashmir, Pakistan
Date: 2005
Magnitude: 7.6
Death toll: 86,000
Facts:
- Landslides and rockfalls damaged roads and blocked relief
- 69,000 injured
- estimated 4 million homeless
- estimated 500,000 deaths through starvation
- $15 billion in economic losses
- Money for rebuilding will be given in July - after the 'working season' (the rainy season starts in July)
Haiti, Carribbean
Date: 2010 (January 12th)
Magnitude: 7.0
Time: 4:53 pm
Death toll: 316,000 (including deaths after the quake)
Facts:
- epicentre was15 miles from Port-au-Prince
- quake occured on a strike slip fault
- 1 million displaced people
- Haiti is the poorest country in the western hemisphere - 72% earning less $2 a day + they recieved $1.1 billion relief aid
- reduction in violent crime but increase in sexual crime against women + children
- damage increased away from the fault as the waves were amplified in softer sediment.
- suffered lateral spreading
Latur, India
Date: 1993
Magnitude: 6.4
Time: 3:56 am
Death toll: 28,000
Facts:
- poor part of the country
- there was a strict cast structure (cast system)
- ^ lorries carrying blankets, tents etc hijacked by the upper classes
- cracks in society made larger by the quake
- damged could have easily been prevented - by wooden supports holding walls together.
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