We present our estimate of pole shift caused by the recent 31 largest earthquakes of magnitude over 8.0. After reviewing theory of perturbation in the Earth’s rotation, each co-seismic as well as post-seismic pole shifts by the earthquakes are acquired and illustrated. A total co-seismic excitation due to these earthquakes is (x1, x2)=(−3.35, 5.89) milliarcsec, which increased about twice the initial estimation when the post-seismic deformation is considered. The single largest co-seismic excitation by 2011 Japan earthquake was (x1, x2)=(−2.06, 2.36) milliarcsec, which corresponds to 9.7 cm pole shift on the surface of the Earth.

Introduction
 Theory Outline
 Recent 31 largest earthquakes ofmagnitude over 8.0 since 1981
 Result and Conclusion
 References

• Sung-Ho Na(Space Geodetic Observation Center, 276-71 Wolsangondan-ro, Sejong 30060, Korea, University of Science and Technology, Yuseong-gu, Daejeon 34113, Korea)
• Jai-Bok Kyung(Department of Earth Science Education, Korea National University of Education, Heungduk-gu, Cheongju 28173, Korea) Corresponding author