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Complexity in the Earthquake Cycle Increases with the Number of Interacting Patches

机译：地震周期中的复杂性随着互动斑块的数量而增加

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摘要

Numerical simulations were performed to examine the effects of heterogeneity of frictional properties on earthquake cycles. In the model, rate- and state-dependent friction was assumed at a planar fault in an infinite uniform elastic medium. Simulated earthquake cycles were compared at model faults with one to four circular patches with velocity-weakening frictional properties. The characteristic slip distances for the patches were varied so that the effects of interactions between patches with different frictional properties could be assessed. Simple periodic, multiperiodic, and aperiodic earthquake cycles were observed in the simulation results. The frequencies of the multiperiodic and aperiodic cycles increased with the number of velocity-weakening patches, suggesting that more complex cycles may occur in a fault as the frictional properties become more heterogeneous. The simulated earthquake cycles were divided into several classes according to the combinations of ruptured patches in the earthquakes. Complex aperiodic earthquake cycles tended to occur when the values of the parameters lay between the parameter ranges for the different patterns. The frequency distribution of simulated earthquake recurrence intervals became more continuous and smooth as the number of patches increased. The simulation results suggest that interactions between many patches with different frictional properties form part of the explanation of realistic complex earthquake cycles.
机译：进行数值模拟以检测摩擦性能异质性对地震循环的影响。在模型中，在无限均匀的弹性介质中假设速率和状态依赖性摩擦。在模拟故障与一到四个具有速度弱化摩擦性质的圆形贴片的模拟故障的模拟地震循环。改变贴片的特征滑动距离，使得可以评估具有不同摩擦性质的贴片之间的相互作用的影响。在模拟结果中观察到简单的周期性，多周期性和非周期性地震循环。随着速度弱化斑块的数量，多周周性和非周期性循环的频率增加，表明在故障中可能发生更复杂的循环，因为摩擦性能变得更加异质。根据地震破裂斑块的组合，模拟地震循环分为几个类。当参数的值在不同模式的参数范围之间铺设时，复杂的非周期性地震循环趋于发生。随着斑块的数量增加，模拟地震复发间隔的频率分布变得更加连续和光滑。仿真结果表明，许多褶皱之间的相互作用，其具有不同摩擦特性的部分，形成了逼真的复杂地震循环的解释。

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