Re: Literally earth-shaking, quake shifted the pole
From: George (george_at_wtfiswrongwithyou.com)
Date: 01/02/05
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Date: Sun, 02 Jan 2005 07:36:25 GMT
"David Ford" <Nospam@internode.on.net> wrote in message
news:41d79d90@duster.adelaide.on.net...
> Dr. Jai Maharaj wrote:
>
>> Forwarded messages Literally earth-shaking, quake shifted the pole By Kitta
>> MacPherson Star-Ledger Staff The Newark Star Ledger
>> Friday, December 31, 2004
>>
> <SNIP>
>> Calculations performed by Richard Gross of NASA's Jet
>> Propulsion Laboratory in California show that the quake
>> sped up the rotation of the Earth and enlarged its
>> wobble, causing the length of a day to shrink permanently
>> by 3 millionths of a second. It also moved the North Pole
>> 1 inch, he found. Gross, a geophysicist who studies the Earth's rotation,
>> attributes the changes to a redistribution of mass. The
>> fissure that opened on the floor of the Indian Ocean
>> during the quake swallowed so much matter that it changed
>> the balance of mass on the Earth, he said. "If you can
>> imagine an ice skater pulling her arms in as she spins,
>> to cause her to spin faster, that's sort of what happened
>> in this case," Gross said. About 1,000 years from now,
>> the length of an Earth day will increase by about a
>> second because of the event, he said.
> <SNIP>
>
>
>
> There seems to be either a logic error here or a reporter mis-quoting or
> misinterpreting. On the one hand, it is said above this made the Earth spin
> faster, but then there is this remark;
>
> "About 1,000 years from now, the length of an Earth day will increase by about
> a second because of the event, he said."
>
> But that means it made Earth spin slower … which contradicts the first
> analogy.
>
> I'm of course pointing this out and querying it because it has enormous
> ramifications for the NET vertical mass movement during this tragic event.
>
> If the length of the day got SHORTER, than this implies NET mass movement
> downward into the mantle, thus Plate Tectonic's subduction would be
> vindicated.
>
> But if the day got LONGER, it implies NET mass movement upward from the
> mantle, thus Earth expansion's net mantle and crustal uplift would be
> vindicated.
Or not.
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