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Summary Earthquakes - Grade 10 IEB Geography $2.84   Add to cart
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Summary Earthquakes - Grade 10 IEB Geography
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  • Course
  • Geography
  • Institution
  • 10

Detailed notes that summarise the Geography IEB syllabus of Earthquakes. Included in these notes are important definitions and concepts to learn as well as diagrams that make the section more understandable.

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Document information

  • January 30, 2021
  • 4
  • 2018/2019
  • Summary

Subjects

  • geography
  • earthquakes
  • seismic waves
  • effects
  • prediction

Written for

  • 10
  • Geography
  • 200
All documents for this subject (12)

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Earthquake
An earthquake is the sudden movement of the crust along the fault line

• When rocks break or crack, vibrations/waves are produced which travel
through the earths crust. I.e earthquakes are caused by faulting.
• Earthquakes occur when pressure builds up between 2 rocks. When the
rocks break it release the energy. The rock moves into a new position and
then rebounds back again
• Earthquakes occur in the uppermost part of the crust extending to a depth
of 65km

Focus- Where the earthquake occurs in the earths crust
Epicentre- Directly above the focus on the earths surface
Isoseismal lines- Lines joining places of equal shock wave intensity.




• The shock is most intense and the most damage is caused at the epicentre
• Outwards from this point the severity of the earthquake decreases in all
directions.
• When the rock ruptures the release of energy causes seismic waves to be
produced. (just as wind energy causes waves in water to move across a
lake or ocean, seismic waves move through the layers of the earth)
• These seismic waves are what produce the destruction that accompany an
earthquake by heaving, shaking and cracking the ground as they pass
through an area





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