Posted on 08/26/2005 11:21:48 AM PDT by anonymoussierra
WASHINGTON - The giant iron ball at the center of the Earth appears to be spinning a bit faster than the rest of the planet.
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The solid core that measures about 1,500 miles in diameter is spinning about one-quarter to one-half degree faster, per year, than the rest of the world, scientists from Columbia University's Lamont-Doherty Earth Observatory and the University of Illinois at Urbana-Champaign report in Friday's issue of the journal Science.
The spin of the Earth's core is an important part of the dynamo that created the planet's magnetic field, and researcher Xiaodong Song said he believes magnetic interaction is responsible for the different rates of spin.
The faster spin of the core was proposed in 1996 by two of the current study's authors, Paul Richards of Lamont-Doherty and Song, now an associate professor at Illinois.
The researchers studied the travel times of earthquake waves through the Earth, analyzing what are called couplets. Those are earthquakes that originate within a half-mile or so of one another but at different times.
They analyzed 30 quakes occurring in the South Atlantic and measured at 58 seismic stations in Alaska and found differences in the travel times and shape of the waves, indicating differences in the core as the waves passed through the center of the Earth.
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Analyzing those differences, they calculated that the core is spinning slightly faster than the rest of the planet and is a bit lumpy.
That solid inner core is surrounded by a fluid outer core about 4,200 miles across.
Since the planet is divided into 360 degrees of longitude, a core spinning one-quarter to one-half degree faster than the outer surface could take between 700 and 1,400 years to get one full revolution ahead.
But Song said in a telephone interview that he expected that rate to vary over time and sometimes the core might be spinning slower than the rest of the planet.
"What we see right now is a snapshot of a long time process between the magnetic field and the inner core," he said. "I do expect to see this rate change with time."
"What is surprising for us is that we could actually see it in such a short time scale," he said, noting the measurements had been made over less than a decade.
Geologists are used to thinking in terms of thousands or millions of years for geological processes, he said.
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The work was funded by the U.S. National Science Foundation and the Natural Science Foundation of China.
How many licks does it take to get to the Tootsie Roll center of the Earth?
It's a matter of geometry that the outside of a wheel travels FASTER than the inside.
You know, the problem here is that the math is just too complicated. If only the UN would declare (globally) that pi is equal to 3, then we wouldn't be having this problem!
Mark
of course this is.... (drum roll) ....Bush's Fault :)
Is this not the reason we apply declination angles when performing land navigation with map and compass? Or is that the whole unified field theory thingummy?
Wonder if this affects GPS readings.
Bush's Fault!
I bet in outer space, billions and billions of miles away, somebody could pick that up with a radio telescope and say to themselves... "garrraaplbbee zzeeeeneeeeejjebeeuu"
Does it? Anyway, if this is physics there need to be some formulas and some numbers.
mmmmmmmmm
Do not taunt happy fun ball!
A one...a two-hoo...a three...a three
Thanks for the post. I for one find this stuff fascinating. I took a couple of Geology courses in college, and have always liked reading stories on the subject, especially when one thinks in terms of "geologic time"...
thank you all
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"It's got to have something to do with Karl Rove.":}}}}}}}}}}}}}}}}}}}}}}}}}}}}thank you
So we can now blame "global warming" on this instead of us?
I'll bet this is the reason Duval's golf game went South.
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