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With Reference To At Least Two Case Studies, One Each From An MEDC and An LEDC, Explain Why LEDC's are More Vulnerable Than MEDC's to Earthquake Hazards.

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  • Essay length: 1608 words
  • Submitted: 28/08/2003
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AS and A Level Hazardous Environments

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With Reference To At Least Two Case Studies, One Each From An MEDC and An LEDC, Explain Why LEDC's are More Vulnerable Than MEDC's to Earthquake Hazards.

An Earthquake is defined as 'A series of vibrations and shock waves which are initiated by volcanic eruptions or movements along the boundaries of oceanic and continental plates.'1 The point of origin is called the focus, with the epicentre being the place on the surface directly above the focus. There are three types of shock waves: Primary; Secondary; and Surface. The energy released by an earthquake, the magnitude, is measured on the ten point Richter Scale. The severity of Ground Movement, the intensity of the earthquake, is measured on the twelve point Mercalli Scale. Figure 1 shows a comparison between the Richter Scale and the Mercalli Scale.

Figure 12

Modified Mercalli Scale

Richter Scale

Earthquakes Per Year

<III

IV-V

VI-VII

VIII-IX

X-XI

>XI

<3.9

4-4.9

5-5.9

6-6.9

7-7.9

>8

830,000

62,000

500

100

20

>0.5

The reasons why an LEDC might be more vulnerable to an earthquake

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