EESA06H3 Chapter 3: chapter 3.docx
Document Summary
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. 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.
