论文部分内容阅读
Vere-Jones branching crack model was developed in 1970s.In this model,the earthquake source is regarded as the result from the total population of crack elements in a critical or near-critical branching process,where the crack propagates through a series of steps.At each step,each crack element simply terminates or generates several other crack elements nearby.Regarding the total number of steps (generations) as the duration time and the total number of crack elements as the total energy released,the following similarities are found between earthquake sources and this model:1.The distribution of energies is asymptotically a Pareto distribution (power law) for the critical case,or a tapered Pareto distribution (tapered power law,Kagan distribution) for the subcritical case.2. VJs branching crack model explains why the EQ magnitude cannot be determined or predicted before the whole source process finishes.3. The number of crack elements at each generation (time step) show similar patterns of earthquake source time functions.