28.5. Seismic Energy Release

Try these first

1. 1.

   What is the formula for calculating seismic energy?

   Hint

   Think about the relationship between energy and magnitude.

2. 2.

   What unit is used to measure seismic energy?

   Hint

   Consider the conversion of energy in scientific contexts.

3. 3.

   What does the formula log E = 1.5M + 4.8 estimate?

   • A. Earthquake duration
   • B. Seismic energy
   • C. Fault line depth

   Hint

   Think about what affects the strength of an earthquake.

4. 4.

   True or False: A magnitude 7.0 earthquake releases more energy than a 6.0.

   • True
   • False

   Hint

   Consider the exponential growth of energy in the logarithmic scale.

5. 5.

   A magnitude 8.5 earthquake occurs. Using the formula, calculate the energy released and discuss its potential implications for urban safety.

   Hint

   Remember to perform logarithmic calculations accurately.

6. 6.

   Compare two earthquakes of magnitudes 6.5 and 7.5, discussing their energy releases and likely impacts on structures.

   Hint

   Think about how structures react to increased energy forces.