Discussion
A P wave travels 600 km in 100 seconds. Its velocity is
Answer: D
Correct answer: 6 km/s
Velocity is distance over time:
\[ V = \frac{600}{100} = 6 \text{ km/s} \]which is a typical P wave velocity in the continental crust. The S wave in the same rock would travel at roughly 3.5 km/s, the ratio of the two being fixed by the elastic constants of the material and close to \( \sqrt{3} \) for a Poisson solid.
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