It sounds impressive doesn't it ... until you realize that stat mainly only reflects population density, not how strong the actual quake was.
If the quake were strong, they'd say half the country felt it, not merely a third of the population, but you can pack a large percentage of the
population into a densely populated space ... say Southern California into the big cities or New York, New Jersey and the Capitol Corridor area and
you don't need an especially strong quake for a lot of people to be inside the area that feels it.
Most that same quake out to an epicenter around Yellowstone, and you barely register in percentage of the population who will feel that same quake.
Not so impressive when you think about it.
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