24.12. Depth Classification of Epicentres

Try these first

1. 1.

   What is an epicentre?

   Hint

   Think about where earthquakes start.

2. 2.

   How deep do shallow-focus earthquakes typically occur?

   Hint

   Consider the classification of earthquakes by their depth.

3. 3.

   What depth range characterizes a shallow-focus earthquake?

   • 0-70 km
   • 70-300 km
   • 300-700 km

   Hint

   Remember the depth categories discussed.

4. 4.

   True or False: Deep-focus earthquakes usually cause more damage than shallow-focus earthquakes.

   • True
   • False

   Hint

   Consider the relationship between depth and surface damage.

5. 5.

   A deep-focus earthquake occurs on the seafloor at a depth of 600 km. Describe the expected ground motion effects on nearby coastal cities 100 km away.

   Hint

   What aspects of wave propagation could affect surface shaking?

6. 6.

   Compare and contrast the potential for human impact during a shallow-focus earthquake versus an intermediate-focus earthquake in a large urban area.

   Hint

   Reflect on how the depth affects the intensity of shaking and resulting damage.