Lesson objectives: Knowledge: All will understand how earthquakes are measured. Most will explain how seismic waves travel and the damage they can cause. Skills: All will evaluate where earthquake damage is greatest and explain why Some will research how the damage from earthquakes can be managed
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Lesson objectives:
Knowledge:
All will understand how earthquakes are measured.
Most will explain how seismic waves travel and the damage they can cause.
Skills:
All will evaluate where earthquake damage is greatest and explain why
Some will research how the damage from earthquakes can be managed
The largest earthquake ever recorded was in Chile. It measured 9.5 on the Richter Scale.
The Richter Scale
This measures the magnitude of a tremor (how powerful it is) using an instrument called a seismograph.
The Richter Scale is measured on a scale from 1 to 10. It is a logarithmic scale which means that a size ‘6’ on the Richter Scale is 10 times more powerful than a size ’5’ and 100 times more powerful than a size ‘4’.
The Richter Scale:0 - 1.9Can be detected only by a Seismograph
2 - 2.9Hanging objects (lampshade) may swing
3 - 3.9Comparable to the vibrations of a passing lorry
4 - 4.9May break windows or cause small objects in your home to fall
5 - 5.9Furniture moves, chunks of plaster may fall from the walls
6 - 6.9Damage is caused to well built structures and severe damage to poorly built structures
7 - 7.9Buildings are displaced from foundations and there are visible cracks in the earth
8 - 8.9Bridges are destroyed and few structures are left standing
9 and overNear total destruction and seismic waves are visible to the naked eye (don’t worry, this rarely happens!)
Where on the scale is it and explain your choice:
1. 2.
3. 4.
Explain in your books in your own words ...
What is the Richter Scale?
A. B.
1. Will the vibrations be greater at A, or B? Why?2. Will the damage be greater at A or at B? Why? 3. An earthquake can occur at any time of day. When might an earthquake do more harm? At 5am OR b) at 10.30am Explain your answer.