 Solution

ID: past-exam-of-the-year-2-of-the-earth-sciences-geology-course-of-the-university-of-oxford/2022/paper-1/6/c/i/solution

At P critical incidence the transmitted P wave travels along the interface. The common horizontal seismic ray parameter is

1/ V_{P 2}

i_{c, P} = arcsin \frac{1500}{3500} = 25.3 8^{\circ} .

The resulting seismic head wave radiates back into the slower upper layer.

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