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Inference of thermodynamic state in the asthenosphere from anelastic properties, with applications to North American upper mantle
Physics of the Earth and Planetary Interiors ( IF 2.4 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.pepi.2020.106639
Christopher Havlin , Ben Holtzman , Emily Hopper

Inference of thermodynamic state and full-spectrum mechanical behavior of the lithosphere and asthenosphere is a central problem in geophysics, implicating our understanding of the convection patterns, transient responses and chemical composition of the planet. Anelasticity is responsible for significant relaxation of stress associated with seismic wave propagation in the asthenosphere, while irreversible transient creep may be important in the lithosphere. This paper focuses on the processes that may act at the time scales of seismic wave propagation, and current questions in the effort to determine the dependence of these effects on thermodynamic state. We introduce a free code library, the “Very Broadband Rheology calculator” (VBRc), designed to calculate frequency-dependent mechanical properties and easily compare different constitutive models favored by different laboratories. The methods operate only in the forward sense, starting with arrays of models of thermodynamic state, proceeding to arrays of mechanical properties. These calculations are incorporated into a Bayesian framework to infer variation in mantle thermodynamic state from Vs and Q, applied here to four locations in Western North America. The results demonstrate how well we can constrain the state, given the input models and the measurements. Results for sites in the Basin and Range, Colorado Plateau and interior craton east of the Rio Grande separate into distinct state variable ranges consistent with their tectonic environments.



中文翻译:

根据非弹性特性推断软流圈中的热力学状态,并将其应用于北美上地幔

岩石圈和软流圈的热力学状态和全光谱力学行为的推论是地球物理学中的一个中心问题,这意味着我们对行星的对流模式,瞬态响应和化学成分有深入的了解。无弹性是造成与软流圈地震波传播有关的应力显着松弛的原因,而不可逆的瞬态蠕变在岩石圈中可能很重要。本文重点研究可能在地震波传播的时间尺度上起作用的过程,以及当前的问题,以确定这些效应对热力学状态的依赖性。我们推出了一个免费的代码库,即“非常宽带流变学计算器”(VBRc),设计用于计算频率相关的机械性能,并轻松比较不同实验室所偏爱的不同本构模型。该方法仅在向前意义上操作,从热力学状态模型阵列开始,一直到机械性能阵列。这些计算被并入贝叶斯框架以推断地幔热力学状态从Vs和Q的变化,此处将其应用于北美西部的四个位置。结果表明,在给定输入模型和测量值的情况下,我们可以很好地约束状态。盆地和山脉,科罗拉多高原和里奥格兰德以东的内部克拉通的遗址的结果分为与构造环境一致的不同的状态变量范围。从热力学状态模型阵列开始,然后进行机械性能阵列。这些计算被并入贝叶斯框架以推断地幔热力学状态从Vs和Q的变化,此处将其应用于北美西部的四个位置。结果表明,在给定输入模型和测量值的情况下,我们可以很好地约束状态。盆地和山脉,科罗拉多高原和里奥格兰德以东的内部克拉通的遗址的结果分为与构造环境一致的不同的状态变量范围。从热力学状态模型阵列开始,然后进行机械性能阵列。这些计算被并入贝叶斯框架以推断地幔热力学状态从Vs和Q的变化,此处将其应用于北美西部的四个位置。结果表明,在给定输入模型和测量值的情况下,我们可以很好地约束状态。盆地和山脉,科罗拉多高原和里奥格兰德以东的内部克拉通的遗址的结果分为与构造环境一致的不同的状态变量范围。在这里应用于北美西部的四个地点。结果表明,在给定输入模型和测量值的情况下,我们可以很好地约束状态。盆地和山脉,科罗拉多高原和里奥格兰德以东的内部克拉通的遗址的结果分为与构造环境一致的不同的状态变量范围。在这里应用于北美西部的四个地点。结果表明,在给定输入模型和测量值的情况下,我们可以很好地约束状态。盆地和山脉,科罗拉多高原和里奥格兰德以东的内部克拉通的遗址的结果分为与构造环境一致的不同的状态变量范围。

更新日期:2021-03-31
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