扬子准地台西北边缘地区地壳稳定性问题

5·12汶川8级大地震影响到整个四川盆地西部地区,该区是扬子准地台与青藏高原造山带的结合部位--台槽交接区,特殊的地震地质构造及其活动性,加上人类活动的影响,使得那里的地壳变得非常脆弱.扬子准地台从早期到晚期的发展过程中活动性比较大,基底硬化程度较低,有显著而广泛的褶皱和断裂运动.在此着重探讨四川盆地以西即从东面的龙泉山开始经成都平原至龙门山地区地壳稳定性问题.

Stability of the Northwest Edges of Yangtze Paraplatform

The Wenchuan earthquake on May 12,2008 struck all the west of Sichuan Basin,which is located in the conjunction of the Yangtze Paraplatform and the Tibet-Qinghai tectonic zone.The specialty and activity of the tectonics and the human behaviors make the crust fragile and crumbly.The paraplatform evolves in different manners from the early to the late period.Its base is relatively less consolidated and the folds and faults develop extensively.This paper focuses on the stability of the crust from the Longquan ...