Slow-slip events in semi-brittle serpentinite fault zones.
Slow-slip events in semi-brittle serpentinite fault zones.
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DOI：
10.1038/s41598-018-24637-z
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发表时间：
2018-04-18
影响因子：
4.6
通讯作者：
Barbot S
中科院分区：
文献类型：
--
作者：
Goswami A;Barbot S
慢滑事件是类似地震的事件，只是滑动速率低得多。虽然同震峰值速度可达每秒数十米，但慢滑速度约为10 - 7±2 m/s，并可能持续数天至数周。在断层摩擦的速率-状态模型下，只有当微凸体的尺寸与临界成核尺寸（摩擦特性的函数）相当时，才会产生慢滑移。然而，不可能所有的俯冲带都具有相同的摩擦性质。除摩擦外，富锑蛇纹岩的塑性流动也可能对地幔楔角附近的断层滑动动力学产生重要影响。在这里，我们表明，产生缓慢滑动的摩擦参数的范围被加宽的存在下，沿着沿着俯冲板块界面的蛇形层。我们观察到增加的稳定性和阻尼的快速破裂在半脆性断裂带所管辖的脆性和粘弹性本构响应。受位错蠕变控制的粘性蛇纹岩流动速率因环境温度升高而增强。当有效粘度被认为是动态的，长期缓慢滑动事件自发出现。整合流变学，热效应，和其他微观物理过程与速率和状态摩擦可能会产生进一步的洞察慢滑现象。
Slow-slip events are earthquake-like events only with much lower slip rates. While peak coseismic velocities can reach tens of meters per second, slow-slip is on the order of 10−7±2 m/s and may last for days to weeks. Under the rate-and-state model of fault friction, slow-slip is produced only when the asperity size is commensurate with the critical nucleation size, a function of frictional properties. However, it is unlikely that all subduction zones embody the same frictional properties. In addition to friction, plastic flow of antigorite-rich serpentinite may significantly influence the dynamics of fault slip near the mantle wedge corner. Here, we show that the range of frictional parameters that generate slow slip is widened in the presence of a serpentinized layer along the subduction plate interface. We observe increased stability and damping of fast ruptures in a semi-brittle fault zone governed by both brittle and viscoelastic constitutive response. The rate of viscous serpentinite flow, governed by dislocation creep, is enhanced by high ambient temperatures. When effective viscosity is taken to be dynamic, long-term slow slip events spontaneously emerge. Integration of rheology, thermal effects, and other microphysical processes with rate-and-state friction may yield further insight into the phenomenology of slow slip.
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影响因子：
5.8
作者：
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通讯作者：
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DOI：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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