Tuesday 22 March 2011

Lesson summary

What is an earthquake?
It's shaking of the ground caused by sudden movement of tectonic plates.

What causes earthquakes?
Quakes are mostly triggered by tectonic plates that slide past each other or collide against each other.

What effects do earthquakes have?
We can easily divided effects of earthquake into three aspects. Social, economic and environmental. First one includes amount of dead people, homelessness, loss of belongings, disease, crime, hunger, disruption in education. Economic effects contains things as lack of money in banks, disruptions in work, loss of workplaces, damage industry, rising taxes, maybe even recession. And environmental as radiation (long-term impact), collapsed buildings, pollution.


How do countries protect themselves from earthquakes?
Japan is country where earthquakes happens most commonly in the world. It's nothing unusual for people and government there so most of the buildings are specially constructed for such an events. They have very big foundations located on ground which are able to withstand quake up to 7 Richter degrees. Buildings are also much more flexible than anywhere else.

What is a tsunami?
Tsunami are large, powerful waves caused by sudden displacement of large quantities of water in the sea or ocean.

What causes tsunamis?
Common causes for the displacement of large quantities of water are: earth quakes, volcanic activity and landslides. 


What effects do tsunamis have?
These giant waves can travel for thousands of miles across the sea and still have enough energy and force to destroy buildings, trees, wildlife and people. When water is withdrawing takes everything with it which caused big loss of belongings. It has also big impact on plants because salt damage crops.

How do countries protect themselves from tsunamis?
Some countries have network of sensors to detect tsunamis and a communications infrastructure to issue timely alarms to permit evacuation of coastal areas.

Why do poor countries suffer more from tsunami?
Firstly poor countries are less prepared for such an events so damages are much bigger. Rich country (MEDC) usually have warning system which helps to rescue people from death and prepared them to protect valuable things. People from poor country are often badly educated and don't know how to protect themselves to survive. Secondly rich countries have more money for rebuilding and recovery. Economy prosper much better so rich country are less likely to have recession. LEDC need much more time to recover because of lack of money and bad economy.

4 comments:

  1. Has this become a weekly blog?

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  2. as far as I know this is JUST 'my economics blog'. there is nothing about how often I will update new things :)

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  3. This stuff on earthquakes - very good!

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  4. Well done! Your answers on the effects of earthquakes and the differing consequences for rich and poor countries are particularly good.

    On the other hand, some more detail is required on the geological processes that cause earthquakes and tsunamis. For example, what are tectonic plates and why are they moving? Also, what kind of plate boundaries produce earthquakes and why?

    We'll discuss points for improvement in more detail next lesson.

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