EARTHQUAKES
IMPORTANT TERMS
• Seismology:
– The study of
earthquakes…seismo
means “shake”

• Fault:
– A break in the Earth’s
crust
– f...
• Stress:
– Any push or pull on the Earth’s crust
– Causes deformation

Plastic Deformation
•Rocks bend like
molded clay
•...
• Deformation:
– The change in the shape of rock in response to
stress

Elastic Deformation
•Rock bends until it breaks
•E...
The point on the
Earth’s
surface…directly
above the focus

Point inside the
earth where an
earthquake
begins
Earthquake Basics
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Earthquake Basics

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Earthquake Basics

  1. 1. EARTHQUAKES
  2. 2. IMPORTANT TERMS • Seismology: – The study of earthquakes…seismo means “shake” • Fault: – A break in the Earth’s crust – formed from stress from tectonic forces
  3. 3. • Stress: – Any push or pull on the Earth’s crust – Causes deformation Plastic Deformation •Rocks bend like molded clay •Does NOT cause earthquakes
  4. 4. • Deformation: – The change in the shape of rock in response to stress Elastic Deformation •Rock bends until it breaks •Elastic rebound •Rock snaps back into original shape •This causes earthquakes
  5. 5. The point on the Earth’s surface…directly above the focus Point inside the earth where an earthquake begins
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