corona
Active member
I think people are missing lots of this. The reason why it sped up the Earths rotation and slowed the day is because the Earthquake was along a subduction zone so more mass was suddenly pulled in towards the centre of the Earth, I never read the article but I'm sure they used the example of a figure skater pulling themselves in and spinning faster. So they speculate the day was shortened by 1.some milliseconds (they can actually only accurately measure the Earths day to 20 milliseconds, below that is all hypothesizing)
But, as there are earthquakes which can slow down the Earths movement (the Java earthquake a few years ago slowed it by 7 milliseconds or something) there are also Earth processes which are speeding it up (such as volcanic activity and converging plates pushing mass outwards) so really this changes are counteracting one another and the days are staying relatively the same year per year. (within milliseconds).
But, as there are earthquakes which can slow down the Earths movement (the Java earthquake a few years ago slowed it by 7 milliseconds or something) there are also Earth processes which are speeding it up (such as volcanic activity and converging plates pushing mass outwards) so really this changes are counteracting one another and the days are staying relatively the same year per year. (within milliseconds).