据悉，断层摩擦的本构模型构成了地震活动模拟的基础。一个被普遍接受的滑移率和摩擦状态相关性框架涉及热激活过程，其中沿微观粗糙度滑移的概率遵循阿伦尼乌斯定律。这个模型已经被实验学家和理论家广泛采用，它预测了直接效应会随着绝对温度的增加而不断增加，但在实验中它真的被观察到了吗？
为了解决该疑问，研究人员利用各种热液、气压和岩性条件下的综合实验室数据进行研究，结果显示，与经典观点相反，给定变形机制的直接影响在很大程度上仍然与温度无关。
相反，直接效应的增量变化通常与脆性到半脆性的转变相一致，在这种转变中，不同的变形机制起作用。这些考虑挑战了经典模型的有效性。研究结果强调，岩石圈内岩石破坏的实际本构规律，应包括活动断裂带内多种变形机制的贡献。
附：英文原文
Title: Does the direct effect of friction increase continuously with absolute temperature？
Author: Barbot, Sylvain
Issue&Volume: 2024-10-10
Abstract: Constitutive models of fault friction form the basis of physics-based simulations of seismic activity. A generally accepted framework for the slip-rate and state dependence of friction involves a thermally activated process, whereby the probability of slip along microasperities adheres to an Arrhenius law. This model, which has become widely adopted among experimentalists and theoreticians, predicts a continuous increase of the direct effect with absolute temperature, but is it observed experimentally Leveraging comprehensive laboratory data across diverse hydrothermal, barometric, and lithological conditions, we demonstrate that, contrary to the classical view, the direct effect for a given deformation mechanism remains largely temperature-independent. Instead, the incremental shifts in the direct effect often coincide with the brittle to semi-brittle transition, across which distinct deformation mechanisms operate. These considerations challenge the validity of the classical model. Realistic constitutive laws for rock failure within the lithosphere must incorporate the contributions of multiple deformation mechanisms within active fault zones.
DOI: 10.1073/pnas.2405111121
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2405111121