lakeview rud, on 26 October 2009 - 11:20 AM, said:
Hi again, folks. Just to clarify my earlier conjecture(for that is all it is) National Geographic I think ran an article tracking the North magnetic pole to be moving at a decent pace (25km/year) towards the current true North Pole(The magnetic north being a manifestation of the earth's magnetic field). My question was why would that be happening and since it could arguably go in any direction there was a reason it was headed for the North pole.
I suspect it isn't moving towards the North Pole. According to Wikipedia: "...the North Magnetic Pole is moving continually northwestward. In 1996 an expedition certified its location by magnetometer and theodolite at 78°35.7′N 104°11.9′W. Its estimated 2005 position was 82°42′N 114°24′W, to the west of Ellesmere Island in Canada. During the 20th century it moved 1100 km, and since 1970 its rate of motion has accelerated from 9 km/year to 41 km/year (2001–2003 average; see also Polar drift). If it maintained its present speed and direction it would reach Siberia in about 50 years, but it is expected to veer from its present course and slow its rate of motion."[/quote]
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...a crustal displacement of say 2400 miles over say 48 hours would likely not be felt as thats only about a 5% change in the rotational surface velocity of the earth.
Pardon? Wouldn't a continent moving at 50 miles per hour would generate a bit of a tsunami?
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Earth's circumference of say 24,000 miles divided by 24 hours gives a rotational velocity of about 1000 miles an hour right now and we don't feel a thing due to the effects of gravity.
The Earth only rotates at 1000 mph at the Equator. Away from there it's slower. And is gravity the reason we don't feel the Earth's movement? I thought it was simply a consequence of inertia. After all, if you're sitting on a bus which is moving along a smooth road, you don't feel its movement, allowing you to easily walk up and down the aisle.
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As to the mechanism by which the earth's solid outer layer would detach from the molten layer and "float" for a number of hours I have no clue but I'd like to hear some arguments for and against.
Well, I seriously doubt this would happen. At least, I think the Earth's crust would move at great speed against the mantle only as a result of a massive catastrophe - like the impact of a Moon-size object. However, I'm not a geologist, so I'm not about to make any definitive statements.