[time-nuts] Result of Earth Quake speeds up earth?

[Neville Michie]

One simple calculation is the ratio of the total rotational energy of  
the planet (which is simple to calculate) to the energy release of  
the earthquake.
The magnitude of the earthquake probably has a relation to the total  
energy release. This must put an upper limit on the change of time.
Since the mass of the planet is conserved, we have the moment of the  
planet and its rotational energy as variables.
The radius of the planet may have changed, so we will eagerly wait to  
see the rate of change of the rotation rate.
It is also possible that the earthquake only caused a phase shift in  
the planets rotation, i.e. the rate of rotation stays the same but  
the time of sunrise has shifted slightly.
Maybe that someone who knows about these things will tell us more.
cheers,
Neville Michie


On 16/03/2011, at 12:29 AM, jimlux wrote:

> On 3/15/11 6:20 AM, jimlux wrote:
>> On 3/15/11 1:49 AM, Chris H wrote:
>
>>> I hear in the Media that the earth quake sped the rotation of the  
>>> earth
>>> up..
>>> Can anyone confirm this?
>>>
>>
>> No.. the magnitude of the change is parts in 1E11 or thereabouts.
>>
>> Regular old tidal drag slowing is bigger, and that's what mostly
>> contributes to leap seconds.
>>
>
>
> Another, potentially easier to detect, effect is that the axis of  
> rotation of the earth might have shifted.
>
> An interesting question is whether earthquakes always lead to a  
> speeding up... Off hand, I would think that the general tendency is  
> for the gravitational forces to make the earth more smooth, which  
> would probably mean that the moment of inertia decreases (speeding  
> up the rotation). (that is, mountains fill ocean trenches in the  
> long run).
>
> On the other hand, rotational forces make the earth more oblate,  
> which increases the moment of inertia.  I seem to recall that the  
> inital predictions of oblateness were made by assuming that there's  
> an equilibrium between gravitational forces pulling in and  
> rotational forces pulling out.
>
>
> And this doesn't even get into the fact that the earth is somewhat  
> pear shaped: wider south of the equator than north. ( most  
> certainly not a banana shape as reported by Sir Bedivere, but what  
> would a medieval experimenter with swallows know anyway)
>
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