Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses
Evidence of Hierarchy in the Complex Fractured System of Geropotamos (Crete, Greece), as Extracted from Transient Electromagnetic Responses
复制标题
从瞬态电磁响应中提取的 Geropotamos（希腊克里特岛）复杂断裂系统中的层次结构证据
DOI：
10.1007/s00024-018-1835-8
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发表时间：
2018
影响因子：
2
通讯作者：
D. Kalisperi
中科院分区：
文献类型：
--
作者：
F. Vallianatos;M. Kouli;D. Kalisperi
本文的基本目标是测试裂隙地质复杂介质中的瞬变电磁响应，并通过将粗糙度参数β与地质地层相关联来更好地理解物理原理。采用反常分数阶扩散方法来描述粗糙多尺度地质结构中的电磁感应。通过对电磁环天线的暂态跳跃响应的分析，揭示了克里特岛Geropotamos盆地的多尺度特性。从后期的透射电子显微镜测量得到的半经验参数与介质的多尺度非均质性相关联。给出了从不同深度的瞬变电磁反演中提取的近地表电阻率分布的一些有趣的性质和近地表电阻率分布的幂定律。在电磁响应的后期，测量回路感应电压的参数γ(β)的分析导致了对电磁地球物理资料解释的不同看法。我们表明，它与Geropotamos地区地质建造中裂缝密度高的地区密切相关。为此，提出了一种局部多尺度经验指标。这篇论文的结果表明，异常扩散可能是电荷载流子分形输运的一种可行的物理机制，解释了在各种自然地质环境中观察到的后期瞬变电磁响应。
The essential goals of this paper are to test the transient electromagnetic (TEM) response in a fractured geological complex medium and to better understand the physics introduced by associating a roughness parameter β to the geological formation. An anomalous fractional diffusion approach is incorporated to describe the electromagnetic induction in rough multi-scaled geological structures. The multi-scaling characteristics of Geropotamos basin in Crete are revealed through the analysis of transient step-off response of an EM loop antenna. The semi-empirical parameters derived from late-time TEM measurements are correlated with the multi-scale heterogeneities of the medium. Certain interesting properties of the late-time slope γ(β) and the power law of near surface resistivity distribution, as extracted from TEM inversion for different depth, are presented. The analysis of the parameter γ(β) which scales the induced voltage in the loop in the late stage of the electromagnetic response leads to a different view of the EM geophysical data interpretation. We show that it is strongly correlated with areas of high fracture density within the geological formations of the Geropotamos area. For that reason, it is proposed as a local multi-scaling empirical index. The results of this paper suggest that anomalous diffusion could be a viable physical mechanism for the fractal transport of charge carriers, explaining observed late-time TEM responses across a variety of natural geological settings.