Geography of     Earthquakes: Getting
Western Canada   Ready For The Big One
What is an Earthquake?

• An earthquake is a sudden, sometimes violent,
  shaking of the ground caused by the sudden
  rel...
What is an Earthquake?

• Earth’s surface sits upon seven large, and several
  smaller, crustal plates that are constantly...
Seven major crustal plates
 and several minor plates
80% of all earthquakes occur
  in the circum-Pacific belt
Seismic Activity

• The west coast of BC is the
  most active seismic area in
  Canada
• 300 small quakes occur
  along th...
Seismic Activity
How are quakes measured?
• The Richter scale measures the amount of energy
  released at the hypocentre
• Each step on the...
Earthquake Vocabulary
• Seismic: having to do with earthquakes
• Subduction zone: long region with a trench
  through whic...
Disaster Planning

• Working in groups of four, imagine how you would
  respond to an earthquake here in Vancouver
• Outli...
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Earthquakes

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Earthquakes

  1. 1. Geography of Earthquakes: Getting Western Canada Ready For The Big One
  2. 2. What is an Earthquake? • An earthquake is a sudden, sometimes violent, shaking of the ground caused by the sudden release of stored energy within the Earth’s crust • Earthquakes are natural events, like snowstorms or tornadoes • Part of an ongoing geologic process that shapes the surface of our planet
  3. 3. What is an Earthquake? • Earth’s surface sits upon seven large, and several smaller, crustal plates that are constantly in motion over the planet’s molten core • There is continuous force within and between each of these plates • When the rock can no longer withstand this stress they suddenly break or slide creating an earthquake
  4. 4. Seven major crustal plates and several minor plates
  5. 5. 80% of all earthquakes occur in the circum-Pacific belt
  6. 6. Seismic Activity • The west coast of BC is the most active seismic area in Canada • 300 small quakes occur along the Juan de Fuca subduction zone every year
  7. 7. Seismic Activity
  8. 8. How are quakes measured? • The Richter scale measures the amount of energy released at the hypocentre • Each step on the scale is ten times greater than the previous one
  9. 9. Earthquake Vocabulary • Seismic: having to do with earthquakes • Subduction zone: long region with a trench through which a descending tectonic plate is assimilated into the earth’s surface • Epicenter: the Earth’s surface directly above the quake • Richter scale: a measure of the power of earthquakes
  10. 10. Disaster Planning • Working in groups of four, imagine how you would respond to an earthquake here in Vancouver • Outline the potential dangers and hazards in your community • Develop a list of the provisions and equipment you would need in the event of an earthquake • Make a poster with your group’s ideas, be creative

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