Numerical simulation of the 2008 West-Bohemian earthquake swarm
Numerical simulation of the 2008 West-Bohemian earthquake swarm
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DOI：
10.1016/j.tecto.2016.11.028
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发表时间：
2017-01-02
期刊：
影响因子：
2.9
通讯作者：
Miller, Stephen A.
中科院分区：
文献类型：
--
作者：
Heinze, Thomas;Hamidi, Sahar;Miller, Stephen A.
长期以来，人们一直怀疑CO2是波希米亚地震群的驱动力，因为震群的迁移性质和地表CO2脱气的表现。迄今为止，建模主要采用线性扩散模型，但缺乏包括耦合流体和岩石力学模型的更复杂的建模。在这项工作中，我们应用一个模型，耦合力学的热量和流量的超临界CO2通过一个裂缝网络。我们提出了一个连续介质力学方法来推导地震矩震级使用偏应变作为一个指标的破裂过程中的个别事件。我们使用峰值检测算法来识别偏应变的快速变化，这表明滑动事件。这种方法已被证明是非常好的工作在干和流体诱导压裂实验在实验室规模，在这项工作中，我们将该方法扩展到西波希米亚/沃格特兰地震群的规模。我们显示出非常好的协议模型的结果和观测的2008年群，进一步支持的假设，波希米亚地震群主要是流体驱动的。(C)© 2016 Elsevier B. V.版权所有。
CO2 has long been suspected of driving the Bohemian earthquake swarms because of the migrating nature of the swarms and expressions of CO2 degassing at the surface. Modeling to date primarily employed linear diffusion models, but more sophisticated modeling that includes a coupled fluid - and rock mechanical model has been lacking. In this work, we apply a model that couples mechanics to heat and flow of a super-critical CO2 through a fracture network. We present a continuum mechanical approach to derive the seismic moment magnitude using the deviatoric strain as an indicator of rupturing processes during individual events. We use a peak-detection algorithm to identify rapid changes in deviatoric strain, indicative of slip events. This method has been shown to work very well in dry and fluid-induced fracturing experiments at the laboratory scale, and in this work we extend the method to the scale of the West Bohemia/Vogtland earthquake swarms. We show very good agreement between model results and observations of the 2008 swarm, further supporting the hypothesis that the Bohemian earthquake swarms are predominately fluid-driven. (C) 2016 Elsevier B.V. All rights reserved.