L4 2015 earthquakes
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Hand in your homework: Journey to the Centre of the Earth
Transcript of L4 2015 earthquakes
Hand in your homework: Journey to the Centre of the Earth
How many earthquakes do you think have occurred in the last 7 days across the world?
• Find out here
L.O: What causes earthquakes and how are they measured?
What are earthquakes and how are
they measured?Video here
L.O: What causes earthquakes and how are they measured?
Epicentre and focusDraw a diagram to locate the focus and epicentre
L.O: What causes earthquakes and how are they measured?
Focus
Epicentre
Epicentre and focus
L.O: What causes earthquakes and how are they measured?
If the epicentre of an earthquake is at ‘A’, which settlement will be damaged the
most? Give reasons for your answer.
L.O: What causes earthquakes and how are they measured?
What are earthquakes and where do they occur?
They can occur at all the major plate boundaries but the most severe earthquakes are normally found at CONSERVATIVE and DESTRUCTIVEboundaries.
CONSERVATIVE
DESTRUCTIVE
L.O: What causes earthquakes and how are they measured?
Card Sort
• In pairs, read the information on the cards
• Work out the correct sequence to explain what causes an earthquake.
• What did you decide?
L.O: What causes earthquakes and how are they measured?
Your Turn!
In your own words try to explain how an earthquake happens – use the correctly ordered cards to help you.
L.O: What causes earthquakes and how are they measured?
Or Your Turn! _____________ are caused when two
_________ moving past each other become ‘stuck’ for a while, so ______ builds up. Eventually the stress becomes so great that the ______ breaks and moves suddenly. The point where the ______ actually breaks is called the _______ , which is __________________. The point on the surface directly above the focus is called the ________ . When plates move suddenly ________ waves are sent out which can cause a lot of _________.
epicentre tension focus shock plates underground crust
damage Earthquakes rock
L.O: What causes earthquakes and how are they measured?
How can we measure earthquakes?
Earthquakes are measured using the Richter Scale. This measures the magnitude of a tremor (how powerful it is) using an instrument called a seismograph.
Although the Richter Scale has no upper limit, the largest known shocks have had magnitudes in the 8.8 to 8.9 range. It is a logarithmic scale which means that a size ‘6’ on the Richter Scale is 10 times larger than a size ’5’ and 100 times larger than a size ‘4’.
L.O: What causes earthquakes and how are they measured?
L.O: What causes earthquakes and how are they measured?
A seismograph
L.O: What causes earthquakes and how are they measured?
A seismograph
L.O: What causes earthquakes and how are they measured?
TASK
• Complete the statement at the top of the sheet.
• Draw illustrations to show how the strength of the Richter scale increases.
• Each box has a description about the amount of damage youwould expect to find.
L.O: What causes earthquakes and how are they measured?
Where on the Richter scale do you think these are?
L.O: What causes earthquakes and how are they measured?
Task
• Write a script for an interview with a geologist as part of a documentary about earthquakes.
• Use the ideas from today’s lesson: - how earthquakes happen - how earthquakes are measured
L.O: What causes earthquakes and how are they measured?
Homework
• Complete your script for a documentary exploring the ideas from today’s lesson: - how earthquakes happen - how earthquakes are measured
• We will listen to them at the start of next lesson!
L.O: What causes earthquakes and how are they measured?
Give me 5!
Give me 5 new ideas
from today’s lesson.
L.O: What causes earthquakes and how are they measured?
HANGMAN
What are earthquakes and how are they formed?
