The Slow Slip of Viscous Faults
The Slow Slip of Viscous Faults
复制标题
粘性断层的缓慢滑动
DOI:
10.1029/2018jb016294
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Dublanchet, Pierre
中科院分区:
文献类型:
--
作者:
Viesca, Robert C.;Dublanchet, Pierre
We examine a simple mechanism for the spatiotemporal evolution of transient, slow slip. We consider the problem of slip on a fault that lies within an elastic continuum and whose strength is proportional to sliding rate. This rate dependence may correspond to a viscously deforming shear zone or the linearization of a nonlinear, rate‐dependent fault strength. We examine the response of such a fault to external forcing, such as local increases in shear stress or pore fluid pressure. We show that the slip and slip rate are governed by a type of diffusion equation, the solution of which is found using a Green's function approach. We derive the long‐time, self‐similar asymptotic expansion for slip or slip rate, which depend on both timetand a similarity coordinateη=x/t, wherexdenotes fault position. The similarity coordinate shows a departure from classical diffusion and is owed to the nonlocal nature of elastic interaction among points on an interface between elastic half‐spaces. We demonstrate the solution and asymptotic analysis of several example problems. Following sudden impositions of loading, we show that slip rate ultimately decays as 1/twhile spreading proportionally tot, implying both a logarithmic accumulation of displacement and a constant moment rate. We discuss the implication for models of postseismic slip as well as spontaneously emerging slow slip events.
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DOI:
10.5860/choice.28-1579
发表时间:
2016
期刊:
--
影响因子:
--
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2008
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期刊:
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通讯作者:
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