Discussion
Which wave is trapped against the ground and travels at the speed of sound?
Answer: D
The Lamb wave is a horizontally propagating acoustic mode with no vertical velocity, trapped against the surface with an amplitude decaying exponentially upward. The pressure wave from the 1883 Krakatoa eruption and the 2022 Tonga eruption circled the globe several times as Lamb waves. It is the only acoustic mode of any meteorological interest.
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