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Inversion of the Kinematics of a Simulated Crack Inside an Artificial Rock

机译:人工岩石内部模拟裂纹的运动学反演

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This paper presents a full waveform inversion of the kinematics of a simulated crack inside an artificial rock plate. A crack was simulated by a piezoelectric crystal embedded inside a gypsum plate, and excited by inputting an electrical signal. Elastic waves emitted from the simulated crack propagated through the plate and were recorded by an array of unique high-fidelity microseismic displacement sensors. This microseismic data is then inverted and the kinematics of the crack modeled by the moment tensor, which can be obtained by deconvolving the recorded signals with the dynamic Green's functions. Green's functions were calculated based on two different models: The first model assumes elastic, homogeneous, and isotropic conditions while the second model assumes anelasticity. The effect of using these two models on the estimated kinematics of the simulated crack was then investigated. The two models result in different Green's functions with a variation of 70≤Q_p≤190 having little effect on the damped result.
机译:本文介绍了人造岩石板内部模拟裂纹运动学的全波形反演。通过嵌入石膏板内部的压电晶体模拟裂纹,并通过输入电信号来激发裂纹。从模拟裂缝发出的弹性波传播通过板,并由一系列独特的高保真微震位移传感器记录下来。然后将这种微地震数据反转,并通过矩张量对裂缝的运动学进行建模,可以通过将记录的信号与动态格林函数解卷积来获得。 Green的函数是根据两个不同的模型计算得出的:第一个模型假设弹性,均质和各向同性条件,第二个模型假设无弹性。然后研究了使用这两种模型对模拟裂纹估计运动学的影响。两种模型产生的格林函数不同,变化范围为70≤Q_p≤190,对阻尼结果的影响很小。

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