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设想了一种两个自由度的滑块—弹簧模型,其中的2个滑块(滑块1和滑块2)由一根弹簧连接,并由一个慢慢移动的传动装置驱动。假设采用与速率和状态相关的摩擦定律,设定摩擦参数,使滑块1发生动态失稳。当摩擦参数接近稳定性转换点时,滑块2就会发生幕式无震滑动。在地震间隔期,当应力累积到大约稳态水平时,滑块2就开始缓慢滑动。随着振幅波动的衰减而成为稳态值,应力和滑动速度会发生准静态振荡。振荡衰减可能是自2001年以来日本东海地区观测到的幕式无震滑动的合理的产生机制。我们还在不同摩擦性质相互作用的双滑块模型的基础上,设想了板块边界上的各种滑动模式。
A two-degree-of-freedom slider-spring model is conceived in which two of the sliders (slider 1 and slider 2) are connected by a spring and driven by a slowly moving transmission. Assuming that the friction law related to the rate and the state is used, the friction parameter is set so that the dynamic instability of the slider 1 occurs. As the friction parameter approaches the stability transition point, the slider 2 undergoes a curtain-free slippage. During the seismic interval, when the stress accumulates to approximately steady-state level, the slider 2 begins to slide slowly. As the amplitude fluctuation decays and becomes a steady-state value, stress and sliding velocity quasi-static oscillation occurs. Oscillation decay may be a reasonable mechanism for the occurrence of the episodic earthquake-induced slip observed in the East China Sea since 2001. Based on the double-slider model with different frictional properties, we also envision various sliding modes on the boundary of the plate.