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

主要进行了以下理论研究：1.通过比较半空间和均匀球形地球模型、均匀球形和层状球形模型中位错引起的同震形变，研究了地球曲率和径向不均匀性对位错研究的影响。据了解，这两种影响都很大。2.针对现有位错理论的不足，提出了一种计算球对称地球模型中点位错激发的渐近变形的新理论。该理论由封闭形式的数学表达式给出，因此数学上简单，易于应用。此外，由于渐近理论包含了球度效应和垂直结构效应，它在物理上比平地理论更合理。3.研究了2000年三宅岛火山和地震活动引起的地壳形变。4.同时，还考虑了同震形变在频谱上的影响，从而观测和确定了卫星重力任务探测同震大地水准面和重力变化的能力。6.导出了同震应变的表达式。研究结果在不同的国家/国际会议上发表，并在8篇论文中发表。

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.