地震破裂传播不仅涉及断层力学状态，而且与断层的物理-化学性质密切相关，因此，它是认识地震发生机制的重要内容和突破口，也是认识断裂演化不可或缺的重要内容。本申请选择汶川地震破裂的龙门山逆冲断裂带中闭锁性质的映秀-北川断裂带和蠕滑性质灌县-安县断裂带，利用地表出露和汶川科钻（WFSD）岩心中已被抬升的不同深度形成的断裂岩为研究对象，通过显微-超显微构造学、地球化学、低温热年代学和岩石磁学研究，认识断裂岩的形成深度、应力状态、不同深度断层同震弱化机制、断层强度，反演地震破裂从震源或近震源深度向浅部传播的过程，并对不同深度断层岩样品进行摩擦实验对比研究，揭示不同深度断裂地震过程中的破裂能和摩擦强度等力学效应，探讨地震断裂破裂传播机制、破裂模式和断裂带演化过程，以及认识蠕滑断裂带中地震破裂机制、物理-化学环境与应力状态。对认识和理解大地震发生和破裂过程，以及对断裂理论、地震动力学的创新和防震减灾都具有重大意义。

The seismic rupture propagation, which is not only related to the fault mechanical state but also closely related to the physical and chemical properties of faults, is of great importance for understanding the seismogenic mechanisms and the fault zone evolution. This application chooses the locked Yingxiu-Beichuan fault and creeping Guanxian-Anxian fault in the Longmen Shan thrust belt, taken fault rocks exhumed from depths in the surface outcrops and the Wenchuan earthquake Fault Scientific Drilling (WFSD) core as the research object, based on the micro- to nano-structures, geochemistry, geochronology and rock magnetic studies, to get the cognition of fault rock generation depths, the stress state, fault weakening mechanisms at different depths, and fault strength, and the seismic rupture propagation from/near the hypocenter to shallow depth. Comparative friction experiments of the fault rocks from different depths will be carried out to reveal the mechanical effects (e.g. frictional strength), the physical-chemical conditions during earthquake faulting, and to explore the seismic rupture and propagation mechanisms, the rupture model, the fault zone evolution. It’s including identifying structure and physical properties of the Guanxian-Anxian fault in order to understand why did the rupture propagate along a creeping fault. The research results will be of great significance to the understanding the complexity of seismic rupture propagation in the continental crust, fault processes during the seismic cycle and earthquakes, seismic hazard associated to creeping faults, and the innovation of the fault rupture theory and the seismological dynamics, as well as the seismic prevention and disaster mitigation.