Seismicity and Earthquake Scales

What is the movement or shaking of the Earth's crust called?

• Volcano

• Earthquake

• Tsunami

• Landslide

What causes the plates to get stuck, leading to pressure build-up?

• Gravity

• Wind

• Friction

• Water

What is the exact location of the crustal movement called?

• Epicentre

• Fault

• Focus

• Seismic wave

What is the point on the surface directly above the focus called?

• Fault

• Epicentre

• Crust

• Seismic wave

What are the series of waves produced during an earthquake called?

• Ocean waves

• Sound waves

• Seismic waves

• Light waves

What percentage of earthquakes are not located along plate margins?

• 10%

• 5%

• 20%

• 15%

What are the cracks in the Earth's crust along which earthquakes occur called?

• Fissures

• Faults

• Trenches

• Ridges

What is the term for the smaller tremors that follow the main earthquake?

• Pre-shocks

• Aftershocks

• Mainshocks

• Foreshocks

What instrument is used to measure seismic waves?

• Seismograph

• Barometer

• Thermometer

• Anemometer

Which type of seismic wave is the fastest and reaches the surface first?

• Secondary (S) waves

• Surface Love (L) waves

• Primary (P) waves

• Rayleigh (R) waves