Abstract
Based on the observation data, it is found that the Lancang-Gengma earthquake sequence is resulting from the propagation of a nonuniform fracture system in which the lengths and strikes of fractures are different from each other, the stress field and medium condition around fractures are also heterogeneous. Therefore, a mechanical model simulating suitably the fracture processes of the Lancang-Gengma earthquake sequence is suggested in this paper. The fracture criterions and computation method for elastic fracture and elasto-plastic fracture are studied. The stress intensity factor, strain energy release rate and J-integral are evaluated respectively. The forward and inverse method jointing a variety of observation data to determine the earthquake fracture processes is also developed in this paper.
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