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Probably refers to earthquakes (https://en.wikipedia.org/wiki/Moment_magnitude_scale).

Cubic meter?

I think GP is referring to this sentence near the end of the article:

>Cooling Yellowstone in this manner would happen at a rate of one metre a year, taking of the order of tens of thousands of years until just cold rock was left.

And I think that sentence is vague enough that any argument using only it as a basis will be pretty weak.

cubic meter.