Discussion
Which event demonstrated the Lamb wave most recently?
Answer: A
The Hunga Tonga eruption generated a pressure pulse recorded by barometers worldwide, circling the globe several times and arriving at predictable intervals consistent with the acoustic speed. It was the clearest such observation since Krakatoa. The other eruptions were meteorologically significant for their aerosol and ash but did not produce a comparable global pressure wave. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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