Homogenization of fault frictional properties

Homogenization of fault frictional properties
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断层摩擦特性的均质化

DOI:
10.1093/gji/ggz327
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发表时间:
2019
影响因子:
2.8
通讯作者:
Viesca, Robert C
Viesca, Robert C
中科院分区:
地球科学2区
文献类型:
--
作者:
Ray, Sohom;Viesca, Robert C

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预计大断层的摩擦特性在空间上会发生变化。然而,断层模型通常假设属性是同质的,或者几乎是同质的。我们调查的条件下,细节的变化可以忽略不计和性能均匀。我们这样做是通过检查摩擦不均匀性下的不稳定加速断层滑动的非线性解决方案的行为。我们考虑一个速率和状态相关的故障摩擦,其中的属性变化的特征波长是一个问题参数。我们发现,均匀化是允许的,只有当波长显示从弹性摩擦长度尺度尺度分离。然而,断层模型还经常包括发生在与弹性摩擦长度相当的距离上的性质转变。我们表明,在这种可比的变化,地震成核不稳定性的动力学控制的属性的空间分布。
The frictional properties of large faults are expected to vary in space. However, fault models often assume that properties are homogeneous, or nearly so. We investigate the conditions under which the details of variations may be neglected and properties homogenized. We do so by examining the behaviour of nonlinear solutions for unstably accelerating fault slip under frictional heterogeneity. We consider a rate- and state-dependent fault friction in which the characteristic wavelength for the property variations is a problem parameter. We find that homogenization is permissible only when that wavelength shows scale separation from an elasto-frictional length scale. However, fault models also often include property transitions that occur over distances comparable to the elasto-frictional length. We show that under such comparable variations, the dynamics of earthquake-nucleating instabilities is controlled by the properties’ spatial distribution.
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发表时间: 2012-02-11
影响因子: 5.2
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期刊: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
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