37.5.1. Seismic Factors

Try these first

1. 1.

   What does PGA stand for?

   Hint

   This term measures the intensity of shaking during an earthquake.

2. 2.

   List one factor that increases liquefaction potential.

   Hint

   Think about what happens during a stronger earthquake.

3. 3.

   What does a higher earthquake magnitude generally indicate for liquefaction?

   • Less risk
   • Greater risk
   • No effect

   Hint

   Consider the relationship between energy and seismic activity.

4. 4.

   True or False: Peak Ground Acceleration (PGA) is irrelevant to liquefaction risk.

   • True
   • False

   Hint

   Think about what PGA specifically measures.

5. 5.

   Given an earthquake with a magnitude of 7.2 and a PGA of 0.7g, predict the liquefaction potential in a loose, saturated soil area and justify your reasoning.

   Hint

   Analyze the effects of both magnitude and acceleration on liquefaction.

6. 6.

   If an area experiences five strong motion cycles during an earthquake, with a magnitude of 6.0, evaluate the risk of liquefaction. What factors would contribute to this evaluation?

   Hint

   Consider how cycle numbers in relation to other variables can influence liquefaction risk.