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首页> 外文期刊>Pure and Applied Geophysics >Characteristics of Viscoelastic Crustal Deformation Following a Megathrust Earthquake: Discrepancy Between the Apparent and Intrinsic Relaxation Time Constants
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Characteristics of Viscoelastic Crustal Deformation Following a Megathrust Earthquake: Discrepancy Between the Apparent and Intrinsic Relaxation Time Constants

机译：Megathrust地震后粘弹性变形特征：明显和内在弛豫时间常数之间的差异

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AbstractThe viscoelastic deformation of an elastic–viscoelastic composite system is significantly different from that of a simple viscoelastic medium. Here, we show that complicated transient deformation due to viscoelastic stress relaxation after a megathrust earthquake can occur even in a very simple situation, in which an elastic surface layer (lithosphere) is underlain by a viscoelastic substratum (asthenosphere) under gravity. Although the overall decay rate of the system is controlled by the intrinsic relaxation time constant of the asthenosphere, the apparent decay time constant at each observation point is significantly different from place to place and generally much longer than the intrinsic relaxation time constant of the asthenosphere. It is also not rare that the sense of displacement rate is reversed during the viscoelastic relaxation. If we do not bear these points in mind, we may draw false conclusions from observed deformation data. Such complicated transient behavior can be explained mathematically from the characteristics of viscoelastic solution: for an elastic–viscoelastic layered half-space, the viscoelastic solution is expressed as superposition of three decaying components with different relaxation time constants that depend on wavelength.]]>
机译：<！[cdata [ <标题>抽象 ara id =“par1”>弹性粘弹性复合系统的粘弹性变形是显着与简单的粘弹性介质不同。在这里，我们表明，即使在非常简单的情况下，在巨大的情况下，在巨大地震发生后，由于在非常简单的情况下，可以发生复杂的瞬态变形。尽管系统的整体衰减率受到哮喘圈的内在弛豫时间常数来控制，但是每个观察点的表观衰减时间常数与放置的地方显着不同，并且通常比近距离的内在弛豫时间常数长得多。在粘弹性松弛过程中，偏移率感逆转，也不罕见。如果我们不符合这些要点，我们可能会从观察到的变形数据中汲取错误的结论。这种复杂的瞬态行为可以从粘弹性溶液的特性进行方式解释：对于弹性 - 粘弹性层状半空间，粘弹性溶液表示为三个腐烂组件的叠加，其不同的松弛时间常数依赖于波长。 ]]>

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