35.5.2. Epicentral Distance

Try these first

1. 1.

   What is epicentral distance?

   Hint

   Think about the epicenter's location.

2. 2.

   How does distance from an earthquake impact PGA?

   Hint

   Consider seismic wave energy as it travels.

3. 3.

   What is the effect of increasing epicentral distance on PGA?

   • Increases
   • Decreases
   • Remains the same

   Hint

   Remember the concept of wave energy loss.

4. 4.

   True or False: GMPEs are used to predict how PGA varies with distance.

   • True
   • False

   Hint

   Consider why we need formulas in seismic engineering.

5. 5.

   Calculate the approximate PGA at a site 25 km from a 7.0 magnitude earthquake using a GMPE that indicates a PGA of 0.5g at 10 km.

   Hint

   Reference GMPE charts or attenuation equations for specific calculations.

6. 6.

   Discuss the engineering implications of utilizing a GMPE with limited data based on regional seismic activity.

   Hint

   Think critically about the consequences of uncertainty in data.