On the physical mechanism of silent slip events along the deeper part of the seismogenic zone
On the physical mechanism of silent slip events along the deeper part of the seismogenic zone
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DOI：
10.1029/2003gl017047
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发表时间：
2003-05-14
影响因子：
5.2
通讯作者：
Iio, Y
中科院分区：
文献类型：
--
作者：
Shibazaki, B;Iio, Y
[1]为了研究最近观察到的无声滑动事件的机制，我们使用迪特里希/鲁伊纳速率和状态相关摩擦定律模拟了地震孕育过程。为了确保不稳定-稳定过渡的真实建模，我们考虑了小的截止速度对过渡区摩擦定律的演化效应。当演化效应的截止速度明显小于直接效应的截止速度时，稳态摩擦表现为低滑移速度时速度减弱，高滑移速度时速度增强。在不稳定-稳定过渡区，这种摩擦行为得到了实验和理论的证实。数值模拟的结果表明，无声滑动的速度高于相对板块运动的速度，最终水平传播沿着不稳定-稳定的过渡，在几年的时间。无声滑动事件可以解释为断层本构律的过渡行为所引起的。
[1] To investigate the mechanism of recently observed silent slip events, we simulated earthquake preparation processes using the Dieterich/Ruina rate- and state-dependent friction law. To ensure realistic modeling of the unstable-stable transition, we considered small cut-off velocity to an evolution effect in the friction law for the transition zone. When the cut-off velocity to the evolution effect is significantly smaller than that of a direct effect, steady state friction behaves as velocity weakening at low slip velocity and velocity strengthening at high slip velocity. This frictional behavior was experimentally and theoretically confirmed for the unstable-stable transition zone. The results of our numerical simulations show that silent slips of which velocity is higher than the velocity of relative plate motion, eventually propagates horizontally along the unstable-stable transition over a period of several years. Silent slip events can be interpreted as being caused by the transitional behavior of the fault constitutive law.