Earthquakes

• Geography
• Lower Secondary (Key Stage 3)

Drag & Drop to label the plate margins correctly

Collision

Constructive

Destructive

Conservative

What are convection currents?

Earthquakes

To identify the causes of an earthquake

To identify the effects of an earthquake

To understand how earthquakes are measured

The point on the earths crust directly above the focus

The point within the crust where the earthquake happens

Seismic waves 'radiate' out from the focus. The further they travel the less power they have

Causes of an earthquake 

Plates move past each other generally 'smoothly'

They sometimes become stuck

Convection currents continue to 'push'

Pressure builds and builds

Plates 'slip' releasing tremendous energy

Seismic waves 'radiate' out from the focus

Plates 'distort' and change shape under the pressure being built

The pressure builds and becomes too powerful causing the plates to 'slip' releasing energy as seismic waves

Plates become stuck. Convection currents continue to move building pressure. 

Why are earthquakes so dangerous?

How do we predict earthquakes?

How do we predict Earthquakes?

Richter Scale: The Richter scale measures the magnitude of an earthquake (how powerful it is).

Mercalli Scale

Measures the Intensity

Records how the earthquake was 'felt'

Based on questionnaires after the event

Measures 1-12 (Roman Numerals)

What instrument measures the energy of an earthquake?

1. Mercalli scale
2. Richter scale
3. Seismometer
4. Seismoment

What scale shows the intensity of an earthquake?

1. Mercalli scale
2. Richter scale
3. Seismometer
4. Seismoment

What scale shows the magnitude of an earthquake?

1. Mercalli scale
2. Richter scale
3. Seismometer
4. Seismoment

What scale measures 1-10

1. Mercalli scale
2. Richter scale
3. Seismometer
4. Seismoment

What scale based on questionnaires?

1. Mercalli scale
2. Richter scale
3. Seismometer
4. Seismoment

What are some of the effects of earthquakes?

Effects

Primary- immediate damage caused by the earthquakes, such as collapsing buildings.​ 

Secondary- are the after effects, such as fires, tsunamis etc.

PRIMARY

SECONDARY

Copy into books

What factors could affect how severe/damaging an earthquake is?

‘Earthquakes don’t kill people, people do’​

What is this statement saying?