【摘要】 龙门山断裂构造带作为川青地块与扬子地块的碰撞边界 ,具有特殊的构造性质及明显的分段性。根据1991年以来GPS观测结果 ,对其分段活动性的研究表明 :断裂带运动速率北段为 1.5 4mm/a ,中段为 2 .77mm/a ,南段为 5 .2 3mm/a。现代构造活动性质总体表现为挤压走滑 ;同时 ,由北向南逐渐由挤压走滑转变为伸展走滑 ,其原因为在青藏高原总体运动条件下的相邻活动断裂的相互作用、相互影响。更多还原

【Abstract】 Longmenshan fault zone, being collision boundary of Chuan Qing with Yangtze block,is charactered by especial tectonic and segmentation.According to GPS measurements from 1991,the study on segmental activity of the fault zone indicates: that present moving velocities of northern segment,middle segment and south segment is 1.54 mm/a,2.77 mm/a and 5.23 mm/a,respectively.As the whole, its present tectonic activity is compressional and of strike slip;from north to south, character of fault zone transfers from compression and strike slip to trend slip,because the Longmenshan fault zone interacts with the reighboring active faults under the condition of whole Qinghai Tibet plateaus tectonic.更多还原