Richter's scale is exponential. A 9 (Boxing Day was 9.1) is twice as bad as an 8. Chicxulub released 50000 Boxing Days in a minute. If 16-bit is 65536 then Chicxulub was a Richter 25. (Hey: they round their numbers, I'll round my numbers.)
And it came with its own tsunami. Mostly in the Gulf (what's now the Austin hillcountry) although, since Panama was then a strait, some waves hit Australia-Antarctica and bounced up to Beringia. Scouring Zealandia en-route.
Yeah, we need to look up.
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