Monday, May 20, 2013

Factoids of the day

Starts with a bang blog has a nice article on earthquakes that includes this factoid:

Well, guess what we notice about the Earth after each-and-every measurable earthquake?
By just the smallest of amounts, the rotational period of a day shortens. For example, the 2011 Japan earthquake (including aftershocks) shortened the day by 1.8 microseconds, the 2010 Chile earthquake shortened the day by 1.26 microseconds, and the 2004 Sumatra quake shortened the day by an astounding 6.8 microseconds!

These are tiny numbers, of course, considering that we lose about 14 microseconds from the 24-hour-day each year just due to tidal friction from the Moon-Earth-Sun system,

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