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Pole flips tied to plate tectonics
Science News ^ | November 19th, 2011 | Alexandra Witze

Posted on 11/26/2011 8:27:27 PM PST by SunkenCiv

Assumed to be caused by random fluctuations in the circulation of the molten iron core, the flips may actually be tied to what's going on at Earth's surface. At times in the geologic past when landmasses have bunched together on one side of the equator, the Earth's magnetic field has begun flipping soon thereafter... "What we see clearly is that the surface positions of the continents are linked with the frequency of the reversals," says group member François Pétrélis, a geophysicist at the French research agency CNRS in Paris...

Computer simulations have shown how molten iron in the spinning core can generate magnetic fields that spontaneously flip direction every so often, so that a compass that once pointed north would suddenly begin pointing south. The last reversal happened around 780,000 years ago. Before that there were times when no flips happened for tens of millions of years, followed by periods with lots of flips... they found that if the flow is interrupted so that it no longer moves symmetrically with respect to the equator, the planet's magnetic field soon reverses... When the distribution of landmasses was lopsided, the team found, magnetic field flips followed soon after. And when continents were more evenly arranged -- such as between about 80 million and 120 million years ago, and again between 260 million and 310 million years ago -- there were long stretches without geomagnetic field reversals.

But a third reversal-free period between around 460 million and 490 million years ago doesn't fit the proposed pattern, because the continents were bunched in the southern hemisphere then, says Trond Torsvik, a geophysicist at the University of Oslo. "I am not terribly convinced with their analysis," he says.

(Excerpt) Read more at sciencenews.org ...


TOPICS: Astronomy; Science
KEYWORDS: catastrophism; continentaldrift; ironsun; oliverkmanuel; olivermanuel; platetectonics; poleflip; poleshift
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Subtitle:
Lopsided arrangement of continents could lead to reversals in Earth's magnetic field

1 posted on 11/26/2011 8:27:28 PM PST by SunkenCiv
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To: 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; ...

Wow, the controversial Oliver Manuel posted a reader comment in this story as well.


2 posted on 11/26/2011 8:28:21 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

yikes, does that mean I’ll start leaning left ?


3 posted on 11/26/2011 8:30:13 PM PST by stylin19a (obama - "FREDO" smart)
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To: stylin19a

Start? We’re onto ya, ya liberal! ;’)


4 posted on 11/26/2011 8:32:14 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

lopsided arrangement of continents?

interesting


5 posted on 11/26/2011 8:35:15 PM PST by GeronL (The Right to Life came before the Right to Pursue Happiness)
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To: stylin19a

Only if your name ends in “ski”


6 posted on 11/26/2011 8:37:26 PM PST by Krankor
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To: SunkenCiv
So that means the planet runs on AC power...Nikola Tesla rules!


7 posted on 11/26/2011 8:40:23 PM PST by darkwing104 (Let's get dangerous)
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To: SunkenCiv

Most of the information I run across on the internet indicates that the pole flip is a gradual event, not a sudden cataclysmic event.


8 posted on 11/26/2011 8:40:32 PM PST by doc1019 (Romney will never get my vote)
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To: GeronL

But we really don’t have a lpsided arrangement of landmasses.

About 40% of Africa, 80% of South America, 100% of Aurstralia and Antartica are all found in the Southern Hemisphere.

About 50% of Africa, 20% of South America, all of North America, Eurasia and Greedland are in the Northern Hemisphere.

Frankly, I think it isn’t all THAT unbalanced!


9 posted on 11/26/2011 8:46:51 PM PST by SatinDoll (NO FOREIGN NATIONALS AS U.S.A. PRESIDENT)
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To: SatinDoll

Earth is pretty big, do the landmasses have enough mass to aactually have so much effect?


10 posted on 11/26/2011 8:50:37 PM PST by GeronL (The Right to Life came before the Right to Pursue Happiness)
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To: SunkenCiv

Hmmmmm, so would the ocean currents reverse themselves if the magnetic poles reverse? Now that would produce some climate change.


11 posted on 11/26/2011 8:59:31 PM PST by Parley Baer
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To: SunkenCiv

Boy, I’ll tell ya, maybe it’s middle-age/LSD flashbacks or both but I thought from the way the title was written this had something to do with Polish guys jumping around or doing training for the Olympics or something. Sheesh!


12 posted on 11/26/2011 9:00:49 PM PST by jmacusa (Political correctness is cultural Marxism. I'm not a Marxist.)
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To: GeronL; doc1019; Fred Nerks

The shift of the magnetic pole is going on right now, the north pole has moved many miles since I was learning the compass offset in Boy Scouts. The reason there's a magnetic pole shift idea may pertain to the fact that the "fossil" magnetism preserved in old lava flows doesn't show a slow change. This suggests to me that the event that caused the shift also caused a lot of volcanic activity -- or caused just the volcanic activity, freezing the magnetic pole where it was for a brief time.
Large changes of the earth's magnetic fields in historical times
by William R. Corliss
Science Frontiers #22: Jul-Aug 1982
By measuring the magnetic properties of bricks and other accurately dated human artifacts, geophysicists can reconstruct the history of the local magnetic field. Near Loyang, China, the field was as much as 54% higher in 300 A.D. than it is now. It was 15% higher in 1500 A.D. In 1000, it was less than today's value.

(Wei, Q.Y., et al; "Intensity of the Geomagnetic Field near Loyang, China, between 500 BC and AD 1900," Nature, 296:728, 1982.)

Comment. Direct measurements of the earth's field go back only a few hundred years, but they are consistent with the data reconstructed from artifacts, both showing a steady decrease since 1500. No one has estimated the effects of these substantial changes on radiocarbon dating and, perhaps, human biology.

13 posted on 11/26/2011 9:04:24 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: darkwing104

:’)


14 posted on 11/26/2011 9:04:32 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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["Earth In Upheaval", Immanuel Velikovsky, p 133]

Most interesting is the discovery that the last time the reversal of the magnetic field took place was in the eighth century before the present era, or twenty-seven centuries ago. The observation was made on clay fired in kilns by the Etruscans and Greeks.

The position of the ancient vases during firing is known. They were fired in a standing position, as the flow of the glaze testifies. The magnetic inclination or the magnetic dip of the iron particles in the fired clay indicates which was the nearest magnetic pole, the south or the north.

In 1896 Giuseppe Folgheraiter began his careful studies of Attic (Greek) and Etruscan vases of various centuries, starting with the eighth century before the present era. His conclusion was that in the eighth century the earth's magnetic field was inverted in Italy and Greece. 7 Italy and Greece were closer to the south than to the north magnetic pole.

P. L. Mercanton of Geneva, studying the pots of the Hallstatt age from Bavaria (about the year 1000) and from the Bronze Age caves in the neighborhood of Lake Neuchatel, came to the conclusion that about the tenth century before the present era the direction of the magnetic field differed only a little from its direction today, and yet his material was of an earlier date than the Greek and Etruscan vases examined by Folgheraiter. But checking on the method and the results of Folgheraiter, Mercanton found them perfect.

An ancient vase found by F. A. Forel in Boiron de Morges, on Lake Geneva, was broken and its pieces were scattered and lay in all directions; when assembled, they all showed one and the same magnetic orientation, which proves again that the magnetic field of the earth was unable to change the orientation originally acquired by the clay when fired and cooled in the kiln. 8

These researches, continued and described in a series of papers by Professor Mercanton, presently with the Service Meteorologique Universitaire in Lausanne, show that the magnetic field of the earth, not very different from what it is today, was disturbed sometime during or immediately following the eighth century to the extent of complete reversal.

[footnotes]

7 G. Folgheraiter in Rendi Conti del Licet, 1896, 1899; Archives des sciences physiques ei naturelles (Geneva). 1899; Journal de physique, 1899; P. L. Mercanton, "La m&hode de Folgheraiter et son r61e en geophysique," Archives des sciences physiques et naturelles. 1907.

8 Bulletin de la Societe Vaudoise des sciences naturelles, Stance du 15 decembre 1909.

9 Manley speaks of "the possibility of its [earth's magnetic field] reversal in historical times, 2500 years ago, to be cleared up by more research." However, the more exact date is, according to the original works of Folgheraiter and Mercanton, the eighth century before the present era, or shortly thereafter.


15 posted on 11/26/2011 9:06:16 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

Also, from what I read, this process takes thousands, if not, millions of years.


16 posted on 11/26/2011 9:06:41 PM PST by doc1019 (Romney will never get my vote)
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To: Parley Baer

Nope. :’)


17 posted on 11/26/2011 9:08:18 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: jmacusa

It seemed that way when I was preparing the post.


18 posted on 11/26/2011 9:08:48 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: GeronL

IMHO, *no*. Not even close.


19 posted on 11/26/2011 9:08:51 PM PST by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

I agree. I wouldn’t doubt that the oceans weigh more than the land masses.


20 posted on 11/26/2011 9:11:44 PM PST by GeronL (The Right to Life came before the Right to Pursue Happiness)
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