24.15.2. Modified Mercalli and Richter Scales

Try these first

1. 1.

   What does the Modified Mercalli Scale measure?

   Hint

   Think about how people might feel during an earthquake.

2. 2.

   On which scale is an earthquake measuring 5.0 considered significant?

   Hint

   Recall the numerics attached to earthquake energy.

3. 3.

   What does the Modified Mercalli Scale measure?

   • Magnitude of seismic waves
   • Intensity of ground shaking
   • Depth of the earthquake

   Hint

   Think about how human perceptions influence measurements.

4. 4.

   True or False: The Richter Scale measures an earthquake's intensity based on personal experiences.

   • True
   • False

   Hint

   Recall the difference between intensity and magnitude.

5. 5.

   In a seismic event where the Richter Scale measures a 7.5, describe how you would expect both the Modified Mercalli Scale ratings and the observable impacts on different building types in various locations.

   Hint

   Consider building integrity and population density in your answer.

6. 6.

   Analyze the relationship between the Modified Mercalli and Richter scales using a historical earthquake event. How did each differ in reporting impacts?

   Hint

   Look for detailed reports on damage to help illustrate your points.