| GPS约束下川滇地区主要断裂现今活动速率的估算方法 |
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| 作者姓名： | 郭晓虎 魏东平 张克亮 |
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| 作者单位： | 1. 中国科学院计算地球动力学重点实验室, 北京 100049;
2. 中国科学院研究生院地球科学学院, 北京 100049;
3. 中国地震局地质研究所地震动力学国家重点实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金(41174084)资助 |
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| 摘 要： | 以川滇地区的GPS水平速度场为约束,建立由24个块体组成的线性弹性块体模型,剔除块体内部变形等对GPS测站速度的影响,反演得到各块体的长期运动速度及各主要边界断裂的现今活动速率.结果显示,在考虑块体内部弹性形变时,拟合速度残差中误差由1.46mm/a减小至1.15mm/a.因此,在用块体模型分析复杂构造地区的运动特征时,还需顾及块体内部形变的影响.
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| 关 键 词： | 川滇地区 GPS 断裂活动速率 块体模型 欧拉矢量 |
| 收稿时间： | 2012-01-19 |
| 修稿时间： | 2012-03-28 |
GPS-constrained estimate method of present-day slip rate along major faults of Sichuan-Yunnan region in China |
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| Authors: | GUO Xiao-Hu WEI Dong-Ping ZHANG Ke-Liang |
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| Institution: | 1. Key Laboratory of Computational Geodynamics, Graduate University, Chinese Academy of Sciences, Beijing 100049, China;
2. College of Earth Science, Graduate University, Chinese Academy of Sciences, Beijing 100049, China;
3. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | In order to obtain the long-term motions of blocks and contemporary slip rates along major bounding faults in Sichuan-Yunnan region,we built a GPS-constrained linear elastic block model with 24 blocks and eliminated the effect of internal deformation of each block. After the elimination of internal deformation effect,the results show that the RMSE of residual velocities decreased from 1.46 mm/a to 1.15 mm/a. Therefore, one should consider the elastic internal deformation effect when analyzing the motion characteristics of tectonically complicated region using block model. |
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| Keywords: | Sichuan-Yunnan region GPS slip rate block model Euler vector |
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