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Theoretical horizontal displacements caused by the 2004 Sumatra earthquake in the Sichuan-Yunnan area have been calculated according to a spherical dislocation theory and an earthquake-fault model.The results show that the theoretical displacements are basically consistent with the GPS observations in situ.On this basis,we have calculated the co-seismic displacements,strains,changes of gravity and geoid of the whole Earth,including China mainland and vicinity,caused by this earthquake.
Theoretical horizontal displacements caused by the 2004 Sumatra earthquake in the Sichuan-Yunnan area have been calculated under a spherical dislocation theory and an earthquake-fault model.The results show that the theoretical displacements are basically consistent with the GPS observations in situ.On this basis, we have calculated the co-seismic displacements, strains, changes of gravity and geoid of the whole earth, including China mainland and vicinity, caused by this earthquake.