Recap on earthquakes

What is an earthquake?

• A vibration on the Earth's crust

• The point of sudden release of energy where seismic waves radiate out

• When the ground becomes unstable and saturated soil flows like liquid

• Unusually large sea waves

What is B

• Fault Line

• Focus

• Epicentre

• Seismic Waves

Earthquakes are caused by the release of _______ pressure in the form of seismic waves due to plates moving along/towards each other and exerting friction

Deep-focus earthquakes are found _____ beneath the earth's crust

• 0-7km

• 7-70km

• 70-700km

• >700km

Shallow focus earthquakes have greater impact on land as the seismic waves take a _____ time to reach the surface

Under what circumstance do deep focus earthquakes cause great impact on the surface

• they occur on a c-c divergent plate

• they occur on a c-c convergent plate

• the subducting plate is less dense than the over riding plate

• if they occur at offshore convergent plate boundaries