Have any other earthquakes made the year shorter before?



  1. 0 Votes

    Just a quick clarification; the Chile didn’t shorten the year.  It shortened the length of a day– by about 1.26 milliseconds. 

    The kind of earthquake that makes the day shorter is called a thrust earthquake.  One plate slides under another, drawing the Earth’s mass a little bit inward in one spot and causing the Earth to spin a bit faster.  The analogy in the article below is a figure skater drawing in her arms as she spins to increase her speed.

    Another quake that may have shortened the day by 6.8 milliseconds was the magnitude 9 quake in Sumatra in December 2004. 

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