Instability Analysis Of Slip Fault With Slanting Edge Crack

In the 1970s, fracture mechanics developed quickly. In recent years, fracture theory is successfully applied to geological, etc. There are a lot of fracture and fault in the earth's crust. Some conclusions of fracture mechanics, especially rock and ceramic fracture conclusions, could be studied the propagation of crust crack and the mechanical process of the earthquake. In the middle of 1960s, some results of fracture mechanics are combined with seismology. It explains force source of seismic fault rupture and low stress drop phenomenon, and is helpful to exploration for physics of earthquake foci. Fracture mechanics viewpoint and method provide a new way to study physics of earthquake foci. It is an important field.This paper divided into five parts which combines the results of mechanics with geological, and mainly explains the low stress drop phenomenon in observation of physics of earthquake foci.The first part is the introduction section. It summarizes the development of fracture mechanics and some of successful application on the geological. It also introduces the related research content and arrangement of this paper. The second part is about some theories and basic formulas which is theoretical basis for the research. The third part analyses a slanting edge crack problem in elastic half plane, and calculates stress intensity factor at the crack tip. The forth part sets up a model of slip fault. The solutions of'a slanting edge crack problem in elastic half plane'is applied on the geological. According to doing nondimensional quantities of the slip fault stress, it analyzes the relations of slanting edge crack and slip fault instability, and quantitatively estimates the low stress drop phenomena in observation of physics of earthquake foci. The fifth part of this paper summarizes the results and puts forward some work should be done in the future.