龙门山断裂带三维滑动速率反演及其分段性研究  

INVERSION OF THREE DIMENSION SLIDING RATE OF LONGMENSHAN FAULT AND CHARACTERS OF ITS SEGMENTS

作　　者：张贵钢 杨志强[1] 王庆良[2] 

机构地区：[1]长安大学测绘与空间信息研究所,西安710054 [2]中国地震局第二监测中心,西安710054

出　　处：《大地测量与地球动力学》2011年第1期5-8,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40974062);中国地震局地震行业科研重点专项基金(200908029);长安大学博士点基金(20060710003)

摘　　要：基于负位错模型,结合粒子群算法反演龙门山中央断裂段的三维滑动速率。反演结果表明,龙门山断裂带的现今构造运动整体而言为右旋逆冲断层,滑动速率较小,其运动特征具有显著的分段性。断裂带南段以逆冲为主,兼有左旋特征;在向北延展过程中逐渐转化为右旋走滑,且走滑分量逐渐加大;龙门山断裂带南北两端具有挤压特征,其中段显示一定的拉张。由此推断,龙门山断裂带现今构造活动,在青藏块体整体移动的影响下,还与其区域应力场和内部地壳结构有关。On the basis of negative dislocation model and PSO algorithm,the three dimension sliding rate of Longmenshan fault was inversed.The inverted results indicate that the modern tectonic movement of the Longmenshan fault zone represents right-lateral thrust and small movement rate as a whole,but its movement has so obvious partition that main feature of the southern section is thrust,coupled with left-lateral and then it may be subjected to the effect of the Xianshuihe fault’s rapidly left-lateral slipping;in addition,along the fault from southern section to north,the slipping movement has translated to right-lateral slip and the slide-slip component has gradually increased.The northern and southern parts of the Longmenshan fault have taken on squeezing;otherwise the midsection shows a certain tension.It is inferred that the current tectonic feature of Longmenshan fault is concerned with the regional stress field and crustal structure in the context of the overall movement of Qinghai-Tibet Plateau.

关 键 词：负位错 粒子群算法 地壳形变 构造运动 龙门山断裂带 

分 类 号：P315.725[天文地球—地震学]