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The richter scale is of more use than the mercalli scale because the mercalli scale doesnt take into account the difference between MEDC and LEDC construction.

Epicenter - the point directly above the focuse where the earthquake is felt first at the earths surface.

Focus - the point underground where the earthquake originates from and the siesmic waves are produced.

  • The causes of earthquakes.
  • Earthquakes can occur at all plate margines.
  • Most commonly they occur at destructive and conservative margins.
  • At conservative margins, two plates move due to convection currents in the mantle and slide past each other at different speeds or different directions.
  • The plates become locked and pressure builds up. 
  • Eventually the plates jolt past each other and the pressure is released as seismic waves which travel from the focus.
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