Control of tectonic inheritance on continental intraplate strain rate and seismicity
Control of tectonic inheritance on continental intraplate strain rate and seismicity
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构造继承对大陆板内应变率和地震活动的控制
DOI：
10.1016/j.tecto.2017.12.014
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发表时间：
2017
期刊：
影响因子：
2.9
通讯作者：
F. Gueydan
中科院分区：
文献类型：
--
作者：
S. Mazzotti;F. Gueydan
现今大陆岩石圈变形和地震活动具有板块边界带（PBZ）和稳定大陆区（SCR）一级二分法的特征。而前者与高应变和地震活动率，后者往往保持不变形，除了在局部地区的较高的应变和地震活动，通常与古PBZ作为本地较弱的域的结晶。由于振幅较低，这些板内应变和地震活动率特别难以测量和表征。在这项研究中，我们提出了一个简单的模型来解释和量化一阶大陆应变率的变化，专注于板内区域。假设近故障平衡的1D岩石圈配置文件，我们推导出稳态应变率驱动的构造力作为流变模型，包括新的应变弱化流变学的功能，以模拟构造继承。在这个框架内，继承的应变弱化在允许和解释应变和地震活动集中在板内弱带中起着根本性的作用：我们的模型预测应变率在板内弱带高达两到三个数量级相比，由于构造遗传流变弱化的影响稳定的dronons。这些模型的预测是一致的经验估计在板内地区，可以提供一个概念框架的SCR应变和地震活动率的表征。
Present-day deformation and seismicity of continental lithosphere are characterized by a first-order dichotomy between Plate Boundary Zones (PBZ) and Stable Continental Regions (SCR). Whereas the former are associated with high strain and seismicity rates, the latter tend to remain un-deformed, except in localized regions of higher strain and seismicity, commonly related to fossilized paleo-PBZ acting as locally weaker domains. Because of their low amplitudes, these intraplate strain and seismicity rates are particularly difficult to measure and characterize. In this study, we propose a simple model to explain and quantify first-order continental strain rate variations, focusing on intraplate regions. Assuming near-failure equilibrium on 1D lithosphere profiles, we derive steady-state strain rates driven by tectonic forces as a function of rheological models that include new strain-weakening rheologies in order to simulate tectonic inheritance. Within this framework, inherited strain-weakening plays a fundamental role in allowing for and explaining strain and seismicity concentration in intraplate weak zones: our model predicts strain rates in intraplate weak zones up to two to three orders of magnitude higher compared to stable cratons due to the effect of tectonic inheritance on rheology weakening. These model predictions are in agreement with empirical estimations in intraplate regions and can provide a conceptual framework for characterization of SCR strain and seismicity rates.
影响因子：
5.3
作者：
Y. Boneh;D. Wallis;L. Hansen;M. Krawczynski;P. Skemer
通讯作者：
Y. Boneh;D. Wallis;L. Hansen;M. Krawczynski;P. Skemer