Simulation of slip transients and earthquakes in finite thickness shear zones with a plastic formulation.
Simulation of slip transients and earthquakes in finite thickness shear zones with a plastic formulation.
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DOI：
10.1038/s41467-018-06390-z
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发表时间：
2018-09-25
影响因子：
16.6
通讯作者：
Lavier LL
中科院分区：
文献类型：
--
作者：
Tong X;Lavier LL
我们进行了阻尼准动态断层滑动的数值实验，其中包括在稳态的速率和状态的行为来模拟地震和塑性流变模型永久应变。模型剪切带具有代表天然断裂带的有限宽度。在这里，我们重现了地震和慢滑事件（SSE）的理论和观测标度关系的快速和缓慢的事件。当剪切区的摩擦降等于一个临界值Δμc时，发生了快速滑移和慢速滑移的转变。在摩擦力下降较低的情况下，SSE几乎使用所有的机械功来积累非弹性应变，而在摩擦力下降较高的情况下，快速滑动使用一些机械功来滑动。我们的新公式取代了速率和状态的状态演化的应力演化与永久性损伤的积累在断裂带及其周围的同步。快速地震和慢速滑动事件（SSE）之间的能量分配差异尚不清楚。在这里，作者提出了一种新的数值技术和塑性配方模型，并提供了一个一阶尝试量化分区弹性能量释放断层带。
We perform numerical experiments of damped quasi-dynamic fault slip that include a rate-and-state behavior at steady state to simulate earthquakes and a plastic rheology to model permanent strain. The model shear zone has a finite width which represents a natural fault zone. Here we reproduce fast and slow events that follow theoretical and observational scaling relationships for earthquakes and slow slip events (SSEs). We show that the transition between fast and slow slip occurs when the friction drop in the shear zone is equal to a critical value, Δμc. With lower friction drops, SSEs use nearly all of mechanical work to accumulate inelastic strain, while with higher friction drops fast slips use some of the mechanical work to slip frictionally. Our new formulation replaces the state evolution of rate and state by the stress evolution concurrent with accumulation of permanent damage in and around a fault zone. Differences in energy partitioning between fast earthquakes and slow slip events (SSEs) remain unclear. Here, the authors present a new numerical technique and plastic formulation to model and provide a first-order attempt at quantifying the partitioning elastic energy release in fault zones.
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