| Study on the Horizontal Deformation Strain Field in the Central and Northern Parts of Yunnan Province |
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| 作者姓名： | Li Yanxing Guo Liangqian ZHANG Zhongfu |
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| 作者单位： | FirstCrustalDeformationMonitoringCenter,CSB,Tianjin300180,China |
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| 摘 要： | Based on the horizontal deformation field and the strain field derived from the GPS data over the period of 1999～2001 in the Yunnan area, the characteristics of deformation and strain in the northern part of Yunnan Province have been studied. The results indicate that the central part of the studied area is rather stable with little crustal displacement, while the western and eastern parts are active with larger displacement. The strain field reveals that the orientations of the principal compressive strain axis of the crust and the sub-blocks in the area are NW-SE, while the orientations of the principal tensile strain axis is NE-SW. In the studied area, the tensile strain is predominatly in the northern part and the compressive strain is predominatly in the central and southern parts. The stretching direction of the shear-strain contour is basically consistent with the strike of the active fault. The strain and stress fields of the fault activity are related to the structure where the fault is located, while the activity properties of the faults are different.
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| 关 键 词： | 地壳变形 GPS 应力场 云南 |
Study on the Horizontal Deformation Strain Field in the Central and Northern Parts of Yunnan Province |
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| Li Yanxing,Guo Liangqian,ZHANG Zhongfu.Study on the Horizontal Deformation Strain Field in the Central and Northern Parts of Yunnan Province[J].Earthquake Research in China,2003,17(1):14-21. |
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| Authors: | Li Yanxing Guo Liangqian and ZHANG Zhongfu |
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| Institution: | First Crustal Deformation Monitoring Center, CSB, Tianjin 300180, China;First Crustal Deformation Monitoring Center, CSB, Tianjin 300180, China;First Crustal Deformation Monitoring Center, CSB, Tianjin 300180, China |
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| Abstract: | Based on the horizontal deformation field and the strain field derived from the GPS data over the period of 1999～2001 in the Yunnan area, the characteristics of deformation and strain in the northern part of Yunnan Province have been studied. The results indicate that the central part of the studied area is rather stable with little crustal displacement, while the western and eastern parts are active with larger displacement. The strain field reveals that the orientations of the principal compressive strain axis of the crust and the sub-blocks in the area are NW-SE, while the orientations of the principal tensile strain axis is NE-SW. In the studied area, the tensile strain is predominatly in the northern part and the compressive strain is predominatly in the central and southern parts. The stretching direction of the shear-strain contour is basically consistent with the strike of the active fault. The strain and stress fields of the fault activity are related to the structure where the fault is located, while the activity properties of the faults are different. |
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| Keywords: | GPS Deformation field Strain field |
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