Crustal deformations caused by seismic and volcanic sources in a spherical earth

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Mainly theoretical research was performed : 1.The effects of the Earth's curvature and radial heterogeneity in dislocation studies were studied, though comparing the coseismic deformations caused by dislocations in half space and homogeneous spherical earth models, a homogeneous sphere and a layer spherical model. It was learnt that both the effects are large. 2.To overcome the disadvantages of the current dislocation theories, a new theory for calculating asymptotic deformations excited by a point dislocation in a spherical symmetric earth model was presented. This theory is given by a closed form of mathematical expressions, so that it is mathematically simple and can be applied easily. Moreover, since the asymptotic theory includes sphericity and vertical structure effects, it is physically more reasonable than the flat-earth theory. 3.The crustal deformation caused by the 2000 Miyakejima volcanic and seismic activities was studied. 4.The co-seismic deformation in spectrum was also considered, so that the ability of satellite gravity missions to detect co-seismic geoid and gravity changes were observed and determined. 6.The expressions of co-seismic strains were derived. The results were presented in different national/international conferences, and published in 8 papers.