Earthquakes

Effects, impacts and facts on earthquakes.

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  • Created by: becky
  • Created on: 29-10-11 17:49

Characteristics

Focus - the place where earthquakes begin,                               deep within the earth's crust.

Epicentre - the point above the focus where the earthquake    is most strongly felt.

Shock waves - waves from the earthquake that radiate             from the epicentre.

Primary waves - weak waves that cause the surface to move in the direction of the wave movement.

Secondary waves - stronger waves that warn of worse to         come.


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Measuring Earthquakes

The richter scale - measures the magnitude (strength) of earthquakes. (1-10)

The Mercalli scale - measures the shaking and damage (intensity). (1-12).



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Damage

Ground shaking - The longer the shaking the more damage is caused.

Landslides - slopes are weakened by strong shaking and give way.

Tsunamis - result when earthquakes occur under the sea.

Liquefaction - Groundwater rises to the surface, turning soft ground to mud.

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