Correlation between elastic energy density and deep earthquakes distribution

Gunawardana P. M.; Morra G.

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Correlation between elastic energy density and deep earthquakes distribution

机译：弹性能量密度与深部地震分布的相关性

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The mechanism at the origin of the earthquakes below 30 km remains elusive as these events cannot be explained by brittle frictional processes. In this work we focus on the global total distribution of earthquakes frequency vs. depth from 50 km to 670 km depth. We develop a numerical model of self-driven subduction by solving the non-homogeneous Stokes equation using the "Particle in cell method" in combination with a conservative finite difference scheme, here solved for the first time using Python and NumPy only. We show that most of the elastic energy is stored in the slab core and that it is strongly correlated with the earthquake frequency-depth distribution for a wide range of lithosphere and lithosphere-core viscosities. According to our results, we suggest that 1) slab bending at the bottom of the upper mantle causes the peak of the earthquake frequency-depth distribution that is observed at mantle transition depth; 2) the presence of a high viscous stiff core inside the lithosphere generates an elastic energy distribution that fits better with the exponential decay that is observed at intermediate depth. (C) 2017 Elsevier Ltd. All rights reserved.

机译：30公里以下地震的起源机制仍然难以捉摸，因为这些事件无法用脆性的摩擦过程来解释。在这项工作中，我们着眼于全球地震频率相对于深度（从50 km到670 km）的总分布。我们通过使用“单元格中的粒子法”结合保守的有限差分方案来求解非均匀斯托克斯方程，从而开发了一种自驱动俯冲的数值模型，此处仅使用Python和NumPy进行了首次求解。我们表明，大部分弹性能都存储在板状岩心中，并且与大范围岩石圈和岩石圈-岩心粘度的地震频率-深度分布密切相关。根据我们的结果，我们认为：1）上地幔底部的平板弯曲导致在地幔过渡深度观测到的地震频率-深度分布的峰值； 2）在岩石圈内部存在高粘性硬核会产生弹性能量分布，该能量分布更适合在中间深度观察到的指数衰减。（C）2017 Elsevier Ltd.保留所有权利。

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《Journal of geodynamics》 |2017年第5期|33-45|共13页
作者
Gunawardana P. M.; Morra G.;
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Univ Louisiana Lafayette, Dept Phys, Lafayette, LA 70504 USA|Syracuse Univ, Dept Earth Sci, Syracuse, NY 13244 USA;

Univ Louisiana Lafayette, Dept Phys, Lafayette, LA 70504 USA;

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Correlation between elastic energy density and deep earthquakes distribution

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