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

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Past exam of the year 2 of the earth sciences (geology) course of the University of Oxford / 2022 / Paper 1 / 6 / b / ii / Solution by

Codex  0 2026-10-25

For the converted reflected S wave, Snell law for elastic waves gives

\frac{s i n i _{S 1}}{900} = \frac{s i n 3 0 ^{\circ}}{1500}, sin i_{S 1} = 0.300.

(1)

Thus $i_{S 1} = 17.4 6^{\circ}$ from vertical, in the upper layer. The converted in-plane mode is SV; an isotropic planar P incidence does not generate an independent SH mode.

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