利用GPS分析川滇地区活动地块运动与应变模型
Crustal Movement and Strain Model of Active Blocks Analyzed by GPS in Sichuan-Yunnan Region
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摘要: 以川滇地区上中国地壳运动观测网络1998～2004年间的GPS观测成果为约束,基于地质学给出了块体划分模型,分别利用刚体运动模型、块体运动和形变模型反演了川滇地区内各活动块体的现今地壳运动和变形参数,并进一步对上述两种模型进行了辨识。结果表明,川滇地区的各块体用块体运动和形变模型来描述更为合适。通过对活动块体及断层运动进行讨论分析,认为川滇地区的地壳运动由西向东、由北向南逐渐减弱,且有顺时针旋转的特征,而地壳变形模式以连续和渐变的剪切为主要特征。Abstract: Constrained by GPS from CMONOC between 1998 and 2004 in Sichuan-Yunnan region,based on geological division of blocks,we inverse the parameters of active blocks about their present-day crustal movement and deformation by rigid body model and movement and strain model separately.With the comparison of these two models by model identification,it is concluded that it is more proper to describe the properties of crustal movement of active blocks by movement and strain model in Sichuan-Yunnan region.Through the analysis of the movement of active blocks and main faults,the results showed that the characters of crustal movement can be represented by clockwise motion,weakened gradually from west to east and from north to south,and the main feature of crustal deformation is continuous and with gradient shear in Sichuan-Yunnan region.?
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