摘要
以青藏高原地区为研究对象,考虑活动地块分区和主要断裂带,建立能反映地表起伏和分层结构的岩石圈三维粘弹性有限元模型。选取合适的模型参数、边界条件和加载条件进行计算,模拟了青藏高原地区的现今垂直隆升速率。研究表明,印度板块对欧亚板块的向北推挤作用是高原隆升的主要动力源。下地壳和岩石圈上地幔在印度板块的向北推挤下不断增厚,从而维持青藏高原地区现今的持续隆升状态。
Consideringthe distribution of active block and major fault zones in Chinese mainland, the three-dimensional viscoelastic finite element model of Qinghai-Tibet plateau is established which reflects the surface relief and lithosphere layered structure. The appropriate model media parameters, boundary conditions and loading conditions are selected for numerical cal- culation, and the present vertical uplift rate of Qinghai-Tibet plateau is simulated. The research result indicates that the northward push of Indian plate to Eurasian plate is the main power source of the uplift of Qinghai-Tibet plateau. Under the northward push of the Indian plate, the lower crust and lithospheric mantle thicken continuously, thus maintains the pres- ent continuous uplift state of Qinghai-Tibet plateau.
出处
《地震地磁观测与研究》
2012年第5期1-6,共6页
Seismological and Geomagnetic Observation and Research
基金
中国地震局地球物理研究所中央级公益性科研院所基本科研业务专项(DQJB10B29
DQJB10B30)资助
关键词
青藏高原
现今隆升
粘弹性有限元模型
三维数值模拟
Qinghai-Tibet plateau, present uplift, viscoelastic finite element model, three- dimensional numerical simulation
