25.2. Classification Based on Depth

Try these first

1. 1.

   What is the depth range for shallow-focus earthquakes?

   Hint

   Think about the depth close to the surface.

2. 2.

   What do we call earthquakes with a depth greater than 300 km?

   Hint

   The name starts with 'Deep' related to distance.

3. 3.

   What depth defines a shallow-focus earthquake?

   • 0-70 km
   • 70-300 km
   • >300 km

   Hint

   Recall the primary depth classifications.

4. 4.

   True or False: Intermediate-focus earthquakes occur at depths greater than 300 km.

   • True
   • False

   Hint

   Think about the classification range.

5. 5.

   Evaluate the impact of a shallow-focus earthquake on a city with high-rise buildings. Consider the effect of depth, distance from the hypocentre, and potential structural designs.

   Hint

   Consider both design constraints and urban planning considerations.

6. 6.

   Research and present on a major earthquake that was classified as deep-focus. Discuss its geological significance despite lower surface damage.

   Hint

   Focus on how studying deep-focus earthquakes reveals information about tectonic processes.