摘要： In this paper we present analytical formulas to compute the coseismic Earth rotation change (polar motion and length of day) and low‐degree gravity field change based on a spherical dislocation theory. Using the preliminary reference Earth model and our formulas, we calculate coseismic changes in Earth's rotation and low‐degree Stokes coefficients caused by the four largest earthquakes since 1960. The results verify that the present method is consistent with previous studies, but the method cannot be verified by the observations. A case study on the 2011 Tohoku‐Oki earthquake (Mw 9.0) indicates that the coseismic Earth rotation change depends on the magnitude and source parameters, and results show a difference between a point source and finite fault model. We also investigate the effect of seawater redistribution on coseismic Earth rotation change, but the effect is small and can be neglected. Key PointsWe present analytical formulasWe calculate coseismic changesWe conduct the case study with the seawater redistribution effect 其他題名： J. Geophys. Res. Solid Earth 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2014-12 出處： Journal of geophysical research. Solid earth, 2014-12, Vol.119 (12), p.9031-9041 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2014. American Geophysical Union. All Rights Reserved. 版權： 2015. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9313 識別號： ISSN: 2169-9356 識別號： EISSN: 2169-9356 識別號： DOI: 10.1002/2014JB011328
