| 基于向-位错模型的同震断层运动反演——以龙门山断层为例 |
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| 关键词:disclination-dislocation model co-seismic GPS data particle swarm optimization inversion slip and rotation of fault |
| 基金项目:国家自然科学基金(编号: 41374028; 41304013); 长安大学中央高校基本科研业务费专项资金(编号: CHD2012TD004); 中国地质调查局国土资源大调查项目(编号: 1212010914015) |
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| 摘要: |
| The Co-seismic Slip and Rotation of the Longmenshan Fault Based on Disclination-dislocation Model Inversed from GPS Data |
| In order to describe the listric Longmenshan fault (the dip angle of the fault plane changed with depth) where MS8.0 Wenchuan earthquake occurred in 2008, the authors put forward the fault model combining disclination with dislocation. The dip angle and the disclination of the Longmenshan fault that changed with depth were calculated from geological data by regression analysis. At the same time, according to the disclination-dislocation model, the co-seismic slip and rotation at different depths of the Longmenshan fault due to Wenchuan MS8.0 earthquake were inversed by PSO algorithm from GPS data. A comparison was made between slip area and magnitude calculated in this study and the data offered by USGS. Based on theoretical analysis and model computation, some conclusions have been reached: (1) Because the dip angle of the Longmenshan fault plane became smaller with the depth, and the slip direction of fault plane changed during the rapture process of the shock, the disclination of the fault took place obviously during the Wenchuan MS8.0 earthquake; (2) The distribution of disclination along depth approximately obeyed the upward parabola, and the earthquake occurred near the curve’s extreme point; (3) Under the same fault parameters, the total slip on fault plane inversed by PSO from GPS data has a similar spatial distribution to but different magnitudes from the data given by USGS, and the difference of magnitude may be related to such factors as the co-seismic disclination components and measurement errors. |
| ZHANG Yong-zhi,ZHANG Ben-ping,WANG Wei-dong,WANG Shuai.2016.The Co-seismic Slip and Rotation of the Longmenshan Fault Based on Disclination-dislocation Model Inversed from GPS Data[J].Acta Geoscientica Sinica,37(3):294-300. |
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