基于三维数据的微粒群反演汶川地震同震滑动

采用2008-05-28汶川大地震的GPS三维同震形变数据,运用微粒群算法,结合位错理论模型,反演龙门山断裂的三维滑动速率。结果表明,龙门山主山前边界大断裂、龙门山后山大断裂、龙门山主中央大断裂均呈现逆冲特征,其中,龙门山主中央大断裂还具有右旋走滑趋势;龙门山主中央大断裂的滑动速率最大,且断层的滑动速率与地表同震位移具有同步响应特征。

Coseismic Slip of Wenchuan Earthquake Inversed by Particle Swarm Optimization Algorithm Using Three-Dimensional Data

Using the three-dimensional coseismic formation GPS data of Wenchuan earthquake in 2008, combined with the dislocation model, the three dimensional velocity of Longmenshan fault is inversed by PSO. The result shows that: Longmenshan Shanqian, Longmenshan Houshan, and Longmenshan Zhongyang faults are reverse faults. Longmenshan Zhongyang fault has dextral character. The greatest velocity is at Longmenshan Zhongyang fault. The slip velocity of the fault corresponds with coseimic dislocation on earth.