PHYS/GEOL 406 Homework
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   Homework #4: Due Friday, February 20, by 5:00pm

Reading:

  • section 2.1.1 (basic reviews of waves)
  • read page 20, and recall that P-waves have different speeds than S-waves
  • section 2.2.5 (Snell's Law) and 2.2.6
  • sections 3.1 and 3.2. Note how 3.2 talks about extracting the speeds from the various layers with a refraction curve such as that in Fig. 3.4.
  • section 3.3 talks about multiple interfaces and how they all show the speeds of the various layers. The field seismogram in Figs. 3.6 and 3.13 should look really familiar after using our 24-lead seismometer. As we did in class, the slopes of the first arrivals give you the wave speeds of each layer.
Assignment:
  1. problem 2.1. And yes, this is a simple application of the old physics-2 relation v=λf.
  2. problem 2.2
  3. problem 2.13. Note that P-waves (longitudinal waves, compression waves) have different wave speeds than S-waves (transverse waves, shear waves). Thus the differing angles of refraction (transmission).
  4. problem 3.4
  5. A field seismogram is given in figure 3.41. (a) Determine the wave speeds for the layers indicated by the seismogram, and (b) determine the depth to the boundary between the layers by using the t-axis intercept as in class. Note: Just putting down numbers for the answers is not sufficient. I have to see how you calculated your numbers. I don't need the seismogram, but I do need to see your calculations. Note: I will go over this method first thing in class Monday morning.
  6. A field seismogram is given in figure 3.42a. (a) Determine the wave speeds for the layers indicated by the seismogram, and (b) determine the depth to the boundary between the layers by using the t-axis intercept as in class.. Note: I will go over this method first thing in class Monday morning.

   That's all for homework #4.