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where,when, magnitude and cause?
LA 1994
- 6.7 magnitude
- centered on the subarb of northridge, north of central LA
- caused by movement along a thrust fault connected with the san andreas fault, and the northwest motion of the pacific plate
hazards?
violent ground shaking lasted for 10- 20 seconds damaging buildings and infrastructure.
- quake triggered thousands of small landslides
exposure?
La metropolitan area has a population of 16.5 million
how vulnerable is LA?
- california richest state in worlds richest country
- investment helped to reduce LA's vulnerability to earthquakes
- the built enviroment is designed for seismic reisistance. Stringment building codes and high levels of preparedness are in place.
impact of northride earthquake, LA>?
- 57 people died
- 680000 people affected, mainly through psychical damage to residential properties and small businesses.
- US$ 43 billion economic damage
- near epiccentre, well engineered buildings survived the shaking without damage.
- many steel framed buildings cracked and reinforced concrete columns columns crushed: investigations showed a need to improve building codes.
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