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首页> 外文期刊>Bulletin of earthquake engineering >Importance of crustal structure and anelastic attenuation for estimating ground motion parameters by finite difference simulation
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Importance of crustal structure and anelastic attenuation for estimating ground motion parameters by finite difference simulation

机译：通过有限差分模拟估算地震动参数的地壳结构和弹性衰减的重要性

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We carry out simulations of seismic wave propagation in anelastic media in order to study the relative importance of source parameters as well as viscoelastic structures in affecting the decay of the ground motions. First, we verify the efficiency of the implementation in a finite difference code of two coarse-grain memory variables methods to model the anelastic behavior of the soil. We find that both methods are sufficiently consistent for a quality factor (Q) larger than 20. Then, we study the relative importance of the focal mechanism, the magnitude, the source depth, the crustal structure and the quality factor in affecting the decay of the ground motions. We verify that the magnitude and the focal mechanism of the source do not have a significant effect on the decay, whereas the focal depth is more important in explaining the variations in decay. The variations of the decay depending on the crustal structure are more difficult to assess. For the shorter distances (up to about 20 km), the velocity structure does not have a significant effect on the decay of the ground motions. The effect of the quality factor is perceptible but remains less important than the effect of the focal depth. However, for epicentral distances larger than about 20 km, both the velocity structure and the quality factor begin to affect significantly the decay. The effect of the quality factor on the decay becomes then even more important than the effect of the focal depth. Therefore, a reduction in the standard deviation of GMPEs could possibly be achieved through taking into account appropriate anelastic attenuation for each region considered. The effect of a 3D velocity structure is studied introducing a typical basin structure. The presence of a sedimentary basin can affect the decay even outside the basin. The spatial difference in ground motion is more pronounced in the elastic case than in the anelastic case.
机译：我们进行地震波在非弹性介质中传播的模拟，以研究震源参数以及粘弹性结构在影响地面运动衰减方面的相对重要性。首先，我们验证了两种粗糙粮食记忆变量方法的有限差分代码实现土壤的非弹性行为的效率。我们发现，对于质量因子（Q）大于20而言，这两种方法是足够一致的。然后，我们研究了震源机制，震级，震源深度，地壳结构和质量因数对影响衰减的相对重要性。地面运动。我们验证了震源的大小和震源机制对衰减没有明显影响，而震源深度对于解释衰减的变化更为重要。取决于地壳结构的衰减变化更加难以评估。对于较短的距离（最多约20 km），速度结构对地震动的衰减没有显着影响。品质因数的影响是可以感知的，但远不如焦深的影响重要。然而，对于大于约20 km的震中距离，速度结构和品质因数都开始显着影响衰减。这样，品质因数对衰减的影响变得比焦深的影响更为重要。因此，通过考虑所考虑的每个区域的适当的非弹性衰减，可以实现GMPEs标准偏差的减小。通过引入典型的盆地结构，研究了3D速度结构的影响。沉积盆地的存在甚至会影响盆地外部的衰变。与无弹性情况相比，弹性情况下地震动的空间差异更为明显。

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