20.9.2. Earthquake Precursors

Try these first

1. 1.

   What are foreshocks?

   Hint

   Think about what happens before a big event.

2. 2.

   How can ground tilting indicate an earthquake?

   Hint

   Consider what happens when a rubber band is stretched.

3. 3.

   What are foreshocks?

   • Smaller earthquakes before a larger quake
   • Larger earthquakes
   • Unrelated tremors

   Hint

   Think about the sequence of earthquakes.

4. 4.

   True or False: Ground tilting can be an indicator of tectonic stress.

   • True
   • False

   Hint

   Consider what happens when pressure builds up underground.

5. 5.

   Explain how scientists might use data from foreshocks and groundwater levels to predict earthquake likelihood.

   Hint

   Consider how multiple data points can provide a clearer picture.

6. 6.

   Discuss the potential limits of using radon emissions as a sole factor in earthquake prediction.

   Hint

   Think about other factors that could cause changes in radon emissions.