29.1. Seismic Magnitude Scales

Try these first

1. 1.

   What does seismic magnitude measure?

   Hint

   Think about what happens during an earthquake.

2. 2.

   Name one limitation of the Richter scale.

   Hint

   Consider when it struggles to measure accurately.

3. 3.

   The Richter Scale is primarily used for measuring which type of earthquakes?

   • Deep earthquakes
   • Local earthquakes
   • Global earthquakes

   Hint

   Think about where it originated from!

4. 4.

   True or False: Moment Magnitude scales saturate for large events.

   • True
   • False

   Hint

   Focus on the definition of Moment Magnitude.

5. 5.

   Calculate the seismic moment if the shear modulus is 30 GPa, the fault area is 100 km², and the average displacement is 0.2 m.

   Hint

   Use the formula for seismic moment.

6. 6.

   Discuss how engineers can benefit from understanding different magnitude scales when designing buildings in seismically active regions.

   Hint

   Consider how magnitude informs building codes and standards.