Diapositiva 1

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UNIT7
The Earths dynamics
MAPS OF SEISMIC RISK
Natural Science 2. Secondary Education
2
UNIT7
Maps of seismic risk
Prevention of seismic risk

• We are not yet able to say exactly where and
  when an earthquake is going to happen. But we can
  reduce seismic risk by preparing risk maps.
• Maps of seismic risk show the areas on Earth
  where most earthquakes occur, which are also the
  areas where it is most likely that earthquakes
  will occur in the future.
• Usually these maps use a single colour, with
  darker shades representing areas with the most
  frequent and most intense earthquakes.
• Measures are taken to prepare areas identified
  as having high seismic risk. Earthquake-resistant
  buildings are constructed and rescue and
  rebuilding techniques are improved.

Natural Science 2. Secondary Education
3
UNIT7
Maps of seismic risk
A map of seismic risk in Spain

• To draw a map of seismic risk in Spain, first we
  have to find out the location, frequency and
  intensity of earthquakes in our country.

• Once we have identified the areas with the most
  frequent and intense earthquakes, we can prepare
  our map of seismic risk.

Natural Science 2. Secondary Education
4
UNIT7
Maps of seismic risk
A map of seismic risk in Spain

• As you can see in the map below, Spains highest
  seismic risk areas (in darker green) are in the
  south. This is because the Eurasian and African
  plates converge in this region.

Frequency and intensity of seismic activity
Low
High
Natural Science 2. Secondary Education