[jpsb]

It would take one big volcano! Remember the Earth's core is solid iron the size of Mars. I would not lose to much sleep over this.

[Pete from Shawnee Mission]

Conjecture is sometimes fun. We can have fun with this. **

1)If an eruption from a little normal volcano like Pinatubo is not great enough, a super volcano eruption that like the Yellowstone caldera deposits enough to create the imbalance.

2) Or, global warming due Chinese pollution heats the ocean surface. the increased evaporation precipitates as increased snow at high latitudes, and the resulting continental glacier unbalances the earth causing it to shift.*

3) A large asteroid strike, such as the one that created the giant crater just north of the Yucatan, and happening at a point in the ocean shallow and the crust is thin? Large super-volcano.

4) A sudden split in the north end of the rift valley in Africa. Water rushes in, fills the rift. The additional weight puts strains on the rift, fissures result, volcanoes grow, ash blocks the sun, global warming and/or cooling results, lava deposits, continental glaciers, death, finger pointing, and settled gloom follow.

*It is predicted that in each instance the shift will occur towards the left as you face east on the equator.
**For discussion purposes only, do not base your personal cosmology or risk your academic standing upon any theory mentioned above.