Abstract
Three different degrees of heterogeneous fault models are simulated by using 2-D random dynamic cellular automata models for analyzing macroscopic behaviors of seismic activity evolution influenced by heterogeneity of fault structures. The results show that the heterogeneities of fault structures can influence evolution properties of the foreshock activity and rupture process, such as the mediate heterogeneous and less heterogeneous structures, which show relatively higher ASR rates and more significant seismic gaps before main shocks. Besides, stress drop distribution ranges of the foreshock events when approaching a main shock show more homogenous (narrower) than that of the foreshock events far from a main shock. So the heterogeneity of fault structures plays an important role in strong earthquake preparation processes.
Highlights
The behaviors of earthquake activity are complicated and various, which are proved by long-term earthquake prediction
Each foreshock events are correlated with main shock in strong earthquake occurrence because cell automata lacks of absolutely time scale and small size of fault grid
According to features of earthquake evolution numerically simulated by three different heterogeneous models, this paper got some main conclusions: 1) Strain release in different stage is complicated and unstable before earthquakes, only half portion of them showed seismic activity reinforced and b value decreased when near a main shock or later stage of foreshock process
Summary
The behaviors of earthquake activity are complicated and various, which are proved by long-term earthquake prediction. That is why the preparation process of strong earthquake has a direct relation with rock heterogeneous medium. (2014) Study on Simulation of Foreshock Activity Properties before Strong Earthquake Using Heterogeneous Cellular Automata Models. In the daily earthquake monitoring and analysis work, we often face to make a prediction whether a strong shock will occur or not when small or medium shock activity is strengthening, researchers have paid more attention for the study to properties and identification of precursory foreshocks and its short-term prediction before strong earthquakes
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