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Earth's Core Spin Direction

09/19/2013 4:07 AM
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Anonymous Poster #1
#1

Re: Earth's Core Spin Direction

09/19/2013 2:30 PM

So if I stand still, will I eventually get to where I'm going???

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#2
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Re: Earth's Core Spin Direction

09/19/2013 10:51 PM

It depends on how long you have and where you want to go.

There are hot spots in the mantle, like Yellowstone Park, where the effects of the hot mantle are seen on the surface. As the core rotates and the North american plate slides, it stands to reason that there may be a thinner part of the plate that will not contain the hot spot as it does over Yellowstone. The North american Plate is sliding to the south west and the core is rotating easterly. That could mean a speeding up of the process, however, I have never read any evidence that the hot spot is changing position faster than the plate movement. As it stands, Winnipeg will be over the hot spot now known as Yellowstone in about 3 million years. If we are off a bit and say Lake Superior moves over the hot spot, we could see some dramatic earth changing action.

I guess if rocks are a form of life, it matters. But the geological processes that will affect "us" are too slow to contemplate. It is kind of like space travel where we attempt to go light years away. It all good conversation and you see, some scientists made money answering the question. Then again we need to get these questions answered to advance our understanding of the space ship earth. And we know that ship is taking us places, eventually.

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#4
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Re: Earth's Core Spin Direction

09/20/2013 4:01 AM

I don't think the spins discussed in the linked article have much, if anything, to do with geological timescales.

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#5
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Re: Earth's Core Spin Direction

09/20/2013 9:31 AM

You are of course correct. I was trying to put another "spin" on the topic. The whole experiment was a theoretical computer modelling exercise. And the magma that could cause a super-eruption like Yellowstone is formed in the mantle due to pressure and not the core. A super-eruption like Yellowstone or like the largest known one La Garita in Colorado (18 million years ago) can have serious side effects. I am, also of course, off topic and cannot relate the spin direction of the core to such incidents like a potential Yellowstone or actual La Garita. The subject is interesting and finding geological relationships to the spins stretched into the mantle, if any, would be of deeper interest.

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Re: Earth's Core Spin Direction

09/19/2013 11:40 PM

Good article. I never knew the center core rotated opposite of the outer core (I thought they both rotated against the surface).

Earlier today, I read an article on hiking and magnetic declination. Magnetic declination is the difference between the magnetic north and true north. When using a compass, you must compensate for this difference, or you'll wind up way off target. In the article, they say that magnetic declination changes based on how far you are from the Mississippi River. Also, magnetic declination changes over time, which follows this article.

Don't you love it when you read one article and in the same day, another (different topic) article confirms the first!

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