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Nepal Earthquake (Hazard vs Disaster (An earthquake occurred on 25th April…
Nepal Earthquake
Hazard vs Disaster
An earthquake occurred on 25th April 2015, 80km North-West of Kathmandu.
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A naturally occurring event like the Nepal earthquake, with potential to cause loss of life or property, is called a natural hazard.
Where a naturally occurring hazard causes social, environmental and economic damage, it becomes a natural disaster.
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The greater the hazard and the more vulnerable people are, the greater the disaster.
Nepalise Earthquake
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$6.6 billion to rebuild, lost $5 billion from the countries GDP
Impacts
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Many buildings collapsed in the capital Kathmandu because they weren't built to withstand earthquakes
Over 100 aftershocks followed the initial earthquake, causing more destruction and deaths
The shaking caused landslides and avalanches on near by mountains, people were stranded on Everest
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Plate Tectonics
Plate Movement
Convection Currents
Radioactive activity in the core heats up the lower mantle and creates convection currents that have friction along the crust and cause the plates to move.
Seafloor Spreading
Huge mid-ocean ridges form as hot magma pushes its way up through the crust and quickly cools and condenses forming new oceanic crust, this pushed the plates apart.
Subduction
As two plates move towards each other, one slides into the mantle in a subduction zone.
Slab Pull
Slab pull is increasingly seen as driving movement. Newly formed oceanic material at mid-ocean ridges becomes denser and thicker as it cools, causing it to sink into the mantle.
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