Discussion
If the P wave velocity in a rock is 5.4 km/s and the S to P velocity ratio is 0.6, the S wave velocity is
Answer: A
Correct answer: 3.24 km/s
The ratio is applied directly:
\[ V_s = 0.6 \times 5.4 = 3.24 \text{ km/s} \]A ratio near 0.58, that is \( 1/\sqrt{3} \), corresponds to a Poisson solid with Poisson’s ratio of 0.25, which most crustal rocks approximate. The ratio is a useful diagnostic in itself: an unusually low value can indicate fracturing or the presence of gas in the pore space.
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