Earthquakes and Society

1
Earthquakes and Society

• Section 3
• Page 234

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Earthquake hazard

• A measure of how often a place is to have
  damaging earthquakes in the future.
• This is determined by past and present seismic
  activity.
• Look at Page 234 figure 1

3
Forecasting

• The number of earthquakes in a area is related to
  the strength of the Earthquakes.
• Earthquakes with less magnitude occur more
  frequently.

4
Gap Hypothesis

• A Earthquake is most likely to occur on a active
  fault where no earthquakes have occurred over a
  period of time
• Seismic gaps- area along faults where few
  earthquakes occur
• Turn page 236

5
Earthquake Resistant Buildings

• Page 237
• Technology
• Mass Damper
• Active tendon System
• Base isolators
• Flexible Pipes
• Cross Braces

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• Active Tendon

• Mass Damper

• Similar to mass damper. Sensors tell the computer
  the building is moving and shift a weight.

• A large weight placed near the top of buildings.
• During a Earthquake the computer will shift the
  weight to keep the building steady.

7

• Base Isolators

• Cross Braces

• Act similar to shocks on a car.
• They absorb seismic waves.
• Made of rubber and steel.

• Made of steel
• They counteract pressure on a building during a
  earthquake.

8

• Flexible Pipes

• The pipes have special flexible joint that allow
  them to bend an not break during a earthquake.
• Uses on Gas and water lines

9
Be Prepared

• Before Shaking Starts

• While Shaking

• Crouch or lie down under a table.
• Stay in a location away from heavy object that
  may fall.

• Safeguarded your home
• Find safe places within each room of your house
• Have a safety plan with (family and neighbors)
• Keep a earthquake safety kit

10
After the Shaking

• Stay away form damage buildings and power lines
• Beware of aftershocks
• Follow safety plan

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12
Earthquake Building

• Draw a perfect Earthquake-Resistant building
• Label the 5 important technologies you used
• Write a sentence explaining each

13
Create A Earthquake Safety Pamphlet

• Describe what to do to your home?
• What things are good to keep in home?
• What to do during and after Earthquake?
• Show pictures