EESA06H3 Chapter Notes - Chapter 3: New Idea, Hypocenter, Epicenter

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12 Aug 2016
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Chapter 3- Earthquakes:
On February 5th, 1663, a violet earthquake struck the Charlevoix-Kamouraska area of
Quebec
-So strong and felt over entire eastern part of North America
-No loss of life reported
-So violent, and terrifying
-This area of Quebec has experience many seismic events over the past two centuries
and is named the Charlevoix-Kamouraska Seismic zone.
-The October 20th, 1870, Baie-St-Paul earthquake was also in this zone.
-These are among the earliest earthquakes to be documented in North America.
What causes earthquakes?
Earthquake: a trembling or shaking of the ground caused by the sudden release of energy
stored in the rocks beneath Earth’s surface.
-Great forces acting deep in the earth may put a STRESS on the rock which may bend or
change in shape (STRAIN).
-Rock can deform only so far before it breaks  when a rock breaks, waves of energy are
released & sent through the Earth  SEISMIC WAVES
-Seismic waves  the waves of energy produced by an earthquake.
-It is the seismic waves that cause the ground to tremble and shake during an
earthquake.
-Sudden release of energy may cause one huge mass of rock to slide past another mass
of rock into a different relative position.
-The break between 2 rock masses is a FAULT.
Classic explanation of why earthquakes take place is called the  elastic rebound theory
Elastic rebound theory  involves the sudden release of progressively stored elastic strain
energy in rocks, causing movement along a fault.
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