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Okay, it significantly affected the rotation of the earth. Based on calculations, it's shifted the location of the north pole (I don't know if they geographic north or magnetic north) by about an inch, and sped the rotation of the earth up such that a day is now a little more than 2.5 microseconds shorter. It changed the shape of the earth, making it slightly more round (a greater trend, apparantly).
Yes, all earthquakes have these kinds of effects to some small degree. But this one's effects were noticebly measureable.
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