25.14.1. Moment Magnitude (Mw)

Try these first

1. 1.

   What does Mw stand for?

   Hint

   Think about what we use to measure the size of earthquakes.

2. 2.

   Name one component of the seismic moment.

   Hint

   These components tell us how much energy was released.

3. 3.

   What does Mw stand for?

   • Moment Magnitude
   • Magnitude Wave
   • Medium Wave

   Hint

   It's the term commonly used among seismologists.

4. 4.

   True or False: The Moment Magnitude scale is only applicable to large earthquakes.

   • True
   • False

   Hint

   Think about how we need to quantify all earthquakes.

5. 5.

   An earthquake occurs on a fault measuring 100 km² with an average slip of 1 meter. If the shear modulus of the rocks is 30 GPa, calculate the seismic moment and corresponding Mw.

   Hint

   Ensure unit consistency while calculating.

6. 6.

   How would you compare the energy release between two earthquakes, one with Mw 6.0 and another with Mw 7.0? Show the energy difference.

   Hint

   Keep in mind the logarithmic nature of the scale.