Abstract: The Sumatra earthquake with magnitude 8.7, occurred near Sumatra Island, on December 26, 2004, has been one of the largest earthquakes since the foundation of global seismic net for almost 100 years. This paper elementarily collects the anomalies of coseismic and post-seismic effect such as seismic activity, crustal deformation and underground liquid and so on observed in China′s mainland, which include the evident seismic activity (especially in Yunnan) increase, obvious crustal deformation, such as the abnormal variation of crustal stress and strain in bore volumetric deformeter and the remarkable change of underground temperature, the chemical component, especially the underground water level. Finally, some possible physical mechanisms, for example the Coulomb stress-triggering mechanism, the dynamic stress-triggering mechanism and the lower crust and upper mantle flow deformation mechanism, which may generate these coseismic and post-seismic anomalies, are discussed.

Key words: Sumatra earthquake with magnitude 8.7, Coseismic and post-seismic effect, Stress triggering, Flow deformation