多种驱动力作用下东亚大陆形变及应力场演化  

EVOLUTION OF THE DEFORMATION AND STRESS PATTERNS OF THE EAST ASIA CONTINENT UNDER MULTI-DRIVING FORCE

作　　者：李祖宁[1] 傅容珊[1] 郑勇[1] 董树谦[1] 

机构地区：[1]中国科学技术大学地球和空间科学系,中国合肥230026

出　　处：《地震学报》2002年第1期17-26,共10页Acta Seismologica Sinica

基　　金：973项目"大陆强震机理与预测"资助

摘　　要：将印度板块持续地向北推进、下伏地幔小尺度对流对增厚大陆岩石层的搬离作用以及剥蚀作用视为形成现今东亚大陆形变和应力场格局的主驱动力 .在一梯形区域内 ,利用数值模拟的方法 ,研究了东亚大陆在不同的边界条件、不同的剥蚀率系数及不同的岩石力学参数条件下的形变及应力场格局 .与现代空间大地测量技术 (GPS)以及利用地震观测得到的结果进行了对比 .结果表明 ,本文模型预测的结果与上述的观测结果有较好的吻合 ,其西部地区比东部吻合得更好 .说明控制东亚大陆西部形变和应力场基本格局的主驱动力 ,来源于印度板块对欧亚板块的碰撞、挤压 ,而对东部地区还应当考虑其与太平洋板块和菲律宾板块的相互作用 .与此同时 。The Indian plate′s continuous motion to the north, the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation on the uplifted plateau are regarded as main driving forces that make the patterns of stress field of East Asia continent at present time. The method of numerical simulation is used to study the deformation and the stress field of East Asia continent under different boundary conditions, different denudation coefficients and different rock mechanics parameters within a trapezoid geological frame. Comparing with the results obtained by modern space geodetic technique (such as GPS) the results derived from seismological data show that the predicted data by our model can fit them very well. The degree of the fitness in the west is better than that in the east. These results imply that the main driving force of the deformation and the stress patterns of the west part of East Asia continent may come from the collision and compression between the Indian and the Eurasia plate. The interaction to the Pacific and the Philippines plate in the east part need to be considered. It also shows that the convective removal to the thickening lithosphere caused by small-scale mantle convection and the effect of denudation cannot be negligible in the evolution of the stress patterns.

关 键 词：东亚大陆 形变 应力场 岩石层 印度板块 搬离作用 剥蚀作用 地震观测 地壳运动 

分 类 号：P315.725[天文地球—地震学]