28.2.1. Richter Magnitude Scale (ML)

Try these first

1. 1.

   What does the Richter scale measure?

   Hint

   Think about what happens during an earthquake.

2. 2.

   Who developed the Richter scale?

   Hint

   Consider whose name is associated with this scale.

3. 3.

   What is the maximum amplitude related to in the Richter formula?

   • Distance from epicenter
   • Seismic waves detected
   • Energy released

   Hint

   Remember what contributes to the Richter calculation.

4. 4.

   The Richter scale is effective for earthquakes with magnitudes up to:

   • 4.5
   • 6.8
   • 8.0

   Hint

   Think about the threshold for reliable measurements.

5. 5.

   An earthquake measurements indicate a maximum amplitude of 400 mm. Calculate the magnitude of the earthquake using the Richter formula if A0 (standard amplitude) is 0.1 mm.

   Hint

   Use the logarithmic properties to simplify the values.

6. 6.

   If a 5.0 magnitude earthquake releases a certain amount of energy, calculate the energy released in Joules for a 7.0 magnitude earthquake.

   Hint

   Remember the relationship of energy release for every magnitude increment.