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2. At the Moho interface of the ocean crust, the velocities change as listed below. (a) Calculate the p and s wave reflection angles and the p and s wave refraction angles assuming a p-wave incident on the Moho making an angle of 30° from the vertical. (b) What is the critical angle? This is the incident angle that produces a refraction angle of 90°, i.e., the wave travels parallel to the boundary (see eq. 6.1 in your book). Layer 1: Vp 6.7 km/s, Vs-4.4 km/s Layer 2: Vp = 8.1 km/s, Vs=5.4 km/s
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Given that & oi y using snells lauo layer & i VP 8.1 km] (6) S.I Sin (30) Su And also Sin (20) sn(o) 5.4 2 37,85 ange

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