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Earth is undergoing true polar wander, scientists say
10-02-2012, 10:29 AM #1
The Survivor Truthtard
Posts:5,013 Threads:522 Joined:Sep 2012
True polar wander is a geophysical theory, a way of thinking about Earth processes that might happen and that these scientists believe do happen. The theory suggests that if an object of sufficient weight on Earth – for example, a supersized volcano or other weighty land mass – formed far from Earth’s equator, the force of Earth’s rotation would gradually pull the object away from the axis around which Earth spins. A supersized volcano far from Earth’s equator would create an imbalance, in other words. As explained at Princeton.edu: If the volcanoes, land and other masses that exist within the spinning Earth ever became sufficiently imbalanced, the planet would tilt and rotate itself until this extra weight was relocated to a point along the equator. That’s the theory of true polar wander. It would cause a movement of Earth’s land masses, but for a different reason than the reason the continents drift in the theory of plate tectonics (formerly called “continental drift”). In the theory of plate tectonics, the continents drift because Earth’s the layer of Earth underlying our planet’s crust (called the mantle) is convective. That is, it circulates, slowly – like water about to boil. In true polar wander, on the other hand, a similar-seeming movement of land masses on Earth’s crust happens in order to correct an imbalance of weight with respect to Earth’s spin. Scientists’ understanding of true polar wander overlaps with their understanding of plate tectonics in various ways. That’s understandable, since it’s all the same Earth. Scientists delving into true polar wander want to know when, in which direction, and at what rate the Earth’s solid exterior might be rotating due to true polar wander. To sort it out, they say, you would need a stable frame of reference to which observations of relative motion might be compared. Doubrovine and his team say they found one: volcanic hotspots. Oceanic hotspots form an island chain. As land plates drift, a successive of volcanoes form over the hotspot. In geology, hotspots are volcanic regions fed by Earth’s underlying mantle. For example, the Hawaiian Islands are believed to have formed over a hotspot in the mantle. The hotspot created a volcano, but then – as that land plate drifted over time, as described by the theory of plate tectonics – the volcano drifted, too, and was eventually cut off from the hotspot. Gradually, another volcano begins to form over the hotspot, right next to the first one. And then it moves on … and another one forms … and so on … and so on. Earth’s crust produces first one, then another volcano over the hotspot until a long chain of volcanoes forms, such as in Hawaii. Hotspots have long been used to understand the motion of tectonic plates. Doubrovine and colleagues went a step further in order to understand true polar wander. Instead of treating the hot spots as static – frozen in place at one spot above Earth’s mantle – their computer model let the hotspots’ positions drift slowly. According to these scientists, this drifting is what produced a model of a stable reference frame, which in turn let them draw conclusions about true polar wander. They say their model does a good job of matching observations of real hotspot tracks on Earth – the path drawn by each hotspot’s island chain – which gives them confidence their results about true polar wander are accurate.

Life is like a penny, you can spend it on what you like, but you can ONLY spend it once.


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10-02-2012, 10:35 AM #2
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,279 Threads:1,438 Joined:Feb 2011
hmm.gif Interesting. Saw this not long ago... Quite an interesting alternative theory.



wonder.gif
10-02-2012, 10:46 AM #3
Octo Mother Superior
Posts:42,606 Threads:1,469 Joined:Feb 2011
wave.gif

Yes interesting, especially about those hotspots. I have read and was also told by a geologist that there were hotspots up in Scandinavia during the ice age leaving some areas habitable. hmm.gif Don't know of any old volcanoes in these parts though...
Anonymous Kritter Show this Post
10-02-2012, 12:27 PM #4
Anonymous Kritter Incognito Anonymous
 

But do you believe these "scientists?"

İmage

İmage

LOL WUT?
10-02-2012, 12:32 PM #5
JayRodney ⓐⓛⓘⓔⓝ
Posts:31,279 Threads:1,438 Joined:Feb 2011
chuckle.gif That one looks really mellow doobie.gif

wonder.gif
10-02-2012, 06:43 PM #6
yankees skier
Posts:5,898 Threads:215 Joined:Feb 2011
Cool stuff.

Biere.
10-02-2012, 08:34 PM #7
The Survivor Truthtard
Posts:5,013 Threads:522 Joined:Sep 2012
(10-02-2012, 12:27 PM)Anonymous Kritter Wrote:  But do you believe these "scientists?"

İmage

İmage

LOL WUT?



Believe? I should say not!

cheers.gif

Life is like a penny, you can spend it on what you like, but you can ONLY spend it once.


https://twitter.com/NigelLondon2014

10-02-2012, 08:45 PM #8
Octo Mother Superior
Posts:42,606 Threads:1,469 Joined:Feb 2011
It is commonly believed Santa lives at the North Pole. 13.gif
10-02-2012, 08:48 PM #9
yankees skier
Posts:5,898 Threads:215 Joined:Feb 2011
(10-02-2012, 08:45 PM)Octo Wrote:  It is commonly believed Santa lives at the North Pole. 13.gif


pffft, he lives in Vegas. coffeetime.gif

Biere.
10-02-2012, 08:55 PM #10
Octo Mother Superior
Posts:42,606 Threads:1,469 Joined:Feb 2011
Off season sure. coffeetime.gif



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