Ground Deformation Due To Asymmetric Slip Of The Kunlun Fault Simulated By Dislocation Model

Fault activity induces the earthquake and the earthquake is a kind of a performance of fault activity. Time and time again,the earthquake contributs to the growth and development of fault,causes the ground rupture,deformation and many kinds of serious disasters.Ground elevates and collapses dramatically,it also causes landslide and shift,pastoral and roads were offset,the buildings collapsed,it is a ghastly sight.The earthquake disaster is intensified significantly in the case of having faults,it brings mankind much more serious disaster. The activity of the fault zone is "culprits" which triggers earthquake,the ground rupture generated by the earthquake is the key reason that result in heavy damage to buildings and losses of life and property of humanity.Therefore,the study of faulting will help to understand the internal dynamics of the Earth,explore the earthquake preparation process, predict earthquakes risk, and maximize the of earthquake disaster reduction.In this paper,based on the east Kunlun fault zone, we analyze its'geological structure background in detail; introduce dislocation theory including its development, and Okada elastic half-space theory model;calculate and study ground deformation caused by symmetric slip model and asymmetric slip model,combining with the geographical conditions and geological structure of the east Kunlun fault zone by using dislocation model;through program design with C language,the relevant parameters of the fault in GMT and geological and geophysical data of the area,carry on the forward solution and simulation of the east Kunlun fault zone.Handling the computational results with GMT software, we get the horizontal and vertical deformation of even dislocation and uneven dislocation of the area, which is a good result; analyzing the relationship between faulting and ground deformation by combining with geological and geophysical data;get some effective outcomes:1.The east Kunlun active fault zone has obvious rupture segmentation characteristics, there are differences in activity level of different sections. The vertical displacement components of the fault is smaller,and the whole fault zone is mainly left-lateral strike-slip fault.2.The fault zone has general structure feature that it is consisted like feather and the abrupt change of local strike.There are a few peak displacement along the fault zone trending. The asymmetric faulting brings about vertical deformation uplift or subsidence area in the steps of the dislocation.3.By computing the ground displacement on the fault planes with symmetric distribution model and asymmetric distribution model,we obtain that the differences of near-field deformation are largest in fault strike slip direction, smaller in direction normal to fault, and smallest in vertical direction.Viewpoints mentioned above is consistence with practical character. It is proved that dislocation theory model is feasible in study on relation between faulting and ground deformation.