A novel EBSD‐based finite‐element wave propagation model for investigating seismic anisotropy: Application to Finero Peridotite, Ivrea‐Verbano Zone, Northern Italy
A novel EBSD‐based finite‐element wave propagation model for investigating seismic anisotropy: Application to Finero Peridotite, Ivrea‐Verbano Zone, Northern Italy
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DOI：
10.1002/2014gl060490
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发表时间：
2014-10
影响因子：
5.2
通讯作者：
X. Zhong;M. Frehner;K. Kunze;A. Zappone
中科院分区：
文献类型：
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作者：
X. Zhong;M. Frehner;K. Kunze;A. Zappone
提出了一种新的基于电子背散射衍射（EBSD）的有限元（FE）波传播模拟方法，并将其应用于橄榄岩样品的地震各向异性研究。有限元模型模拟地震波沿沿着任何选定方向通过代表性2D EBSD截面的动态传播。数值模型允许分离的晶体择优取向（CPO）和形状择优取向（SPO）的影响。所获得的地震速度相对于标本的方向进行了比较与Voigt-Reuss-Hill估计和实验室测量。这三种方法的结果都证明了CPO是控制地震各向异性的主导因素。裂缝充填物和少量矿物如角闪石只有在其体积比例足够大（高达23%）时才会影响地震各向异性。与其他因素相比，SPO的影响较小。所提出的有限元模型进行了讨论，其潜力在模拟地震波传播的EBSD数据代表天然岩石岩组。
A novel electron backscatter diffraction (EBSD) ‐based finite‐element (FE) wave propagation simulation is presented and applied to investigate seismic anisotropy of peridotite samples. The FE model simulates the dynamic propagation of seismic waves along any chosen direction through representative 2D EBSD sections. The numerical model allows separation of the effects of crystallographic preferred orientation (CPO) and shape preferred orientation (SPO). The obtained seismic velocities with respect to specimen orientation are compared with Voigt‐Reuss‐Hill estimates and with laboratory measurements. The results of these three independent methods testify that CPO is the dominant factor controlling seismic anisotropy. Fracture fillings and minor minerals like hornblende only influence the seismic anisotropy if their volume proportion is sufficiently large (up to 23%). The SPO influence is minor compared to the other factors. The presented FE model is discussed with regard to its potential in simulating seismic wave propagation using EBSD data representing natural rock petrofabrics.