Earth's axial tilt delta measured...

[Squatch]

http://www.uai.it/index.php?tipo=A&id=662

"...the terrestrial axis shifted two thousandths of an arcsecond"

"The influence this shifting will have on weather is irrelevant. Dr. Bianco reminds that natural variations due to the nutation, that is oscillations of the terrestrial axis over a short period of time, are indeed more intense."

[indigobusiness]

1. But what is this doing to the magnetic field?

It is already in a weakening phase.

[FreeCajun]

2. faster spin = more intense

[Squatch]

3. Faster spin is not due to the axial tilt

[Massacure]

4. Axial tilt is how well aimed at the sun the pole are.

It has nothing to do with spin.

[Squatch]

5. The poles aren't "aimed" at the sun

The sun strikes the earth in an area between the tropics of Capricorn and Cancer about the equator.

[Massacure]

6. No of course it doesn't. But it moves the poles closer or further from it.

[FreeCajun]

7. Not what I meant

The axial tilt has very little effect on the planetary magnetic field.
The earth's spin has increased because the quake made the planet slightly more compact: a good analogy is an ice skater holding her arms wide and spinning slowly and pulling them in to spin faster. This increase in speed means that a day is now 3 microseconds shorter than it was previously, so the net effect on the magnetic field would be to increase it slightly, since it is dependant upon the speed of the rotation of the earth's nickel-iron core.

I couldn't find the first article I saw about this, but there are some here and there on the net.

http://news.scotsman.com/international.cfm?id=1474002004
http://tvnz.co.nz/view/news_world_story_skin/466502%3fformat=html

I suggest http://www.nature.com and http://www.newscientist.com for information about the science behind the tsunami, there will probably be more items of interest in them in the weeks ahead.