Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Perturbation in the Earth's Pole due to the Recent 31 Large Earthquakes of Magnitude over 8.0

  • Na, Sung-Ho (Space Geodetic Observation Center) ;
  • Kyung, Jai-Bok (Department of Earth Science Education, Korea National University of Education)
  • Received : 2016.07.18
  • Accepted : 2016.09.22
  • Published : 2016.09.30
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Abstract

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 ($x_1$, $x_2$)=(-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 ($x_1$, $x_2$)=(-2.06, 2.36) milliarcsec, which corresponds to 9.7 cm pole shift on the surface of the Earth.

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References

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