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If a shockwave from something like an explosion travels into the ground, why will it refract? The speed of sound is far different in the ground, but what would make it refract? I can’t seem to find anything on this.

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    $\begingroup$ Related post by OP: physics.stackexchange.com/q/808403/2451 $\endgroup$
    – Qmechanic ♦
    Commented Mar 31 at 15:13
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    $\begingroup$ Because the speed of sound is different. Transmission/reflection coefficients are all about changes in wave propagation conditions. $\endgroup$
    – Jon Custer
    Commented Mar 31 at 15:14

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