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03/18/2011 11:28 AM ID: 88358 Permalink   

Are Days Shorter After Japan Quake?

 

After the 9.0 magnitude earthquake in Japan a week ago, scientists guess that days on earth might be shorter now. The quake might also have moved the Earth´s axis.

Complex calculations indicate that the quake might have caused the Earth to rotate faster. Our days are now supposedly 1.8 microseconds shorter than before. Earth´s axis position might have shifted 6.5 inches.

However, both changes are not noticable for mankind.

The earthquake in Japan was the fifth largest since 1900.

 
  Source: www.nasa.gov:80  
    WebReporter: walktheline Show Calling Card      
  Recommendation:  
ASSESS this news: BLOCK this news. Reason:
   
  9 Comments
  
  0.000018 seconds lost  
 
If we lose 0.000018 seconds every day, it would take over 1,000,000 years to see a 1 second difference in our 24hr day!
 
  by: kalika   03/18/2011 02:23 PM     
  yes kalika  
 
however with teh moon futther away from earth (as it moves 1.5 inches further away eash year), the added 6.5 inch tilt could change weather patterns..
 
  by: shannon853   03/18/2011 02:31 PM     
  @shannon853  
 
Somehow I doubt it when we´re talking inter celestial body distances. But I could be wrong.

[ edited by velger ]
 
  by: velger   03/18/2011 05:30 PM     
  @story  
 
Why the undue skepticism not present in the source article?

"After the 9.0 magnitude earthquake in Japan a week ago, scientists guess that days on earth might be shorter now."

It´s not a *guess*, it´s mathematical calculation.

"The quake might also have moved the Earth´s axis."

Not "might have," but "did."

"Complex calculations indicate that the quake might have caused the Earth to rotate faster."

Again, not "might have," but "did."

"Our days are now supposedly 1.8 microseconds shorter than before."

*Supposedly*? They are. If you read the rest of the article, it goes on to show how the length of the day changes all the time, basically because the world has a gigantic mass of liquid (the world ocean) and gas (atmosphere) which are constantly in motion.
 
  by: Ben_Reilly     03/18/2011 07:28 PM     
  @ben  
 
The March 11, magnitude 9.0 earthquake in Japan <b>may</b> have shortened the length of each Earth day and shifted its axis. But don´t worry—you won´t notice the difference.

Using a United States Geological Survey <b>estimate</b> for how the fault responsible for the earthquake slipped, research scientist Richard Gross of NASA´s Jet Propulsion Laboratory, Pasadena, Calif., applied a complex model to perform a preliminary <b>theoretical</b> calculation of how the Japan earthquake—the fifth largest since 1900—affected Earth´s rotation. His calculations indicate that by changing the distribution of Earth´s mass, the Japanese earthquake <b>should</b> have caused Earth to rotate a bit faster, shortening the length of the day by about 1.8 microseconds (a microsecond is one millionth of a second).

[ edited by jamesmc ]
 
  by: jamesmc   03/19/2011 03:41 AM     
  @james  
 
Those words indicate a lack of absolute mathematical precision, not the possibility that nothing happened, as the summary´s words such as "guess" would imply.
 
  by: Ben_Reilly     03/19/2011 06:11 AM     
  i hate ben o´reilly  
 
with a passion, that´s why I call him Bill, he´s really bill in disguise. With that being said, he´s actually right this time. This is poorly written, I´ve read hundreds of scientific reports from all over the world to confirm that it actually IS shorter, and our axis actually HAS tilted, not a weird "guess" but actual mathmatical fact.

Sorry for the spoiler Ben, but I guess a blind squirrel gets a nut every once in a while.
 
  by: meshuggahfan   03/21/2011 08:44 PM     
  observation/calculation  
 
I don´t think any of this has been observed.

It all makes sense, and im sure the geologists, seismologist, etc involved know their stuff. but this is exactly what they wouldve told you a month ago if you said - "9.0 earthquake in this location, what are the results?"

That being said, I do believe it. But observation is important. Hopefully its coming shortly.


[ edited by reverend j roach ]
 
  by: reverend j roach     03/23/2011 03:41 AM     
  1.8 microseconds,  
 
my goodness, better adjust the clocks...
 
  by: H. W. Hutchins   03/23/2011 11:53 AM     
 
 
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