Complexity in the earthquake cycle increases with the number of interacting patches
Complexity in the earthquake cycle increases with the number of interacting patches
复制标题
地震周期的复杂性随着相互作用斑块数量的增加而增加
DOI：
10.1007/s00024-020-02555-4
复制
发表时间：
2020
影响因子：
2
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Kato;N.
进行数值模拟来检查摩擦特性的异质性对地震周期的影响。在该模型中，假设无限均匀弹性介质中平面断层处的摩擦力与速率和状态相关。在模型断层处对模拟地震周期进行了比较，该断层具有一到四个具有减弱速度摩擦特性的圆形斑块。补丁的特征滑动距离是不同的，以便可以评估具有不同摩擦特性的补丁之间相互作用的影响。模拟结果中观察到了简单的周期性、多周期和非周期性地震周期。多周期和非周期旋回的频率随着速度减弱斑块数量的增加而增加，这表明随着摩擦特性变得更加不均匀，断层中可能会出现更复杂的旋回。根据地震中破裂斑块的组合，将模拟的地震周期分为几类。当参数值位于不同模式的参数范围之间时，往往会发生复杂的非周期性地震周期。随着斑块数量的增加，模拟地震复发间隔的频率分布变得更加连续和平滑。模拟结果表明，具有不同摩擦特性的许多斑块之间的相互作用构成了对现实复杂地震周期的部分解释。
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.