Thank you for your helpful response. I do remember the 2004 Indian Ocean earthquake causing a measurable shift of this earth, and then again with the recent quake near Japan. What I have not read is which direction from polar north the earth shifted.
I think the big earthquakes nudged the earth’s axis of rotation? I don’t think they affected the earth’s magnetism.
The Japan earthquake this year actually moved the whole island by over a meter. (slid it closer to the mainland, I believe).
http://www.gpsworld.com/survey/news/gps-shows-dramatic-position-shifts-japan-earthquake-11212