地质通报Issue(1)：71-82,12.
青藏高原巴颜喀拉地块构造形变特征的数值模拟
Numerical modeling analysis of the tectonic deformation of Bayan Har block in the Ti-betan Plateau
摘要
Abstract
A series of strong earthquakes have occurred in the Tibetan Plateau since 1997, distributed along the peripheral faults of Bayan Har block. It is necessary to study the overall tectonic deformation of Bayan Har block. With the constraints from GPS obser⁃vation, the tectonic deformation of the Bayan Har block and its periphery faults was investigated based on an elasto-plastic plane stress finite element model. The results show that the elastic model could not explain the current GPS observation in the Bayan Har block. When East Kunlun fault and Yushu-Xianshuihe fault were in the plastic yield state (with relative large sliding), the calculated velocity field is consistent well with the observation values, suggesting that most of the current shear deformations (strain localizations) were absorbed by these two faults. In addition, if the recurrence intervals of large earthquakes are used to limit the relative yield strength of major faults, the major faults around Bayan Har block entered the plastic yield state in the following order:The Yushu-Xianshuihe faults and the middle segment of East Kunlun faults first entered the yield state in succession. Then, the Margaichaka-Ro⁃laKangri faults (Mani segment) and Heishibeihu faults would enter the yield state, and the eastern segment of East Kunlun faults and Longmenshan faults entered the yield state at last. This indicates that the overall movement of Bayan Har block shows sectional and periodical characteristics.关键词
巴颜喀拉地块/数值模拟/弹塑性/构造形变Key words
Bayan Har block/numerical simulation/elasto-plastic model/tectonic deformation分类
天文与地球科学引用本文复制引用
孙玉军,范桃园,周春景,吴中海..青藏高原巴颜喀拉地块构造形变特征的数值模拟[J].地质通报,2015,(1):71-82,12.基金项目
中国地质调查局项目（编号12120114002101、1212011120163）、国家自然科学基金项目（批准号41204066）和中央级公益性科研院所基本科研业务费项目 （）
