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Homework #4: Due Friday, February 20, by 5:00pm
- 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:
- problem 2.1. And yes, this is a simple application of the old physics-2 relation v=λf.
- problem 2.2
- 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).
- problem 3.4
- 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. - 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. |