Seismic attenuation due to wave‐induced flow: Why Q in random structures scales differently
Seismic attenuation due to wave‐induced flow: Why Q in random structures scales differently
复制标题
DOI：
10.1029/2006gl026789
复制
发表时间：
2006-08
影响因子：
5.2
通讯作者：
Tobias Malte Müller;E. Rothert
中科院分区：
文献类型：
--
作者：
Tobias Malte Müller;E. Rothert
波致流体流动是地震波在非均质多孔固体中的一种重要耗散机制，有几种模型被报道用于量化波衰减。然而，它的特征频率依赖于随机异质结构仍然不清楚。对于一般的双重孔隙结构，根据第一原理计算压缩波的比衰减。它示出了如何在材料特性和异质性尺度的对比转化为特征的频率依赖性的衰减。这一结果解释了在具有周期和随机无序的层状多孔介质中地震波衰减的渐近行为所观察到的差异。
Wave‐induced fluid flow is an important dissipation mechanism of seismic waves in heterogeneous porous solids and several models are reported to quantify the wave attenuation. However, its characteristic frequency dependence in randomly heterogeneous structures remains unclear. For a generic double‐porosity structure the specific attenuation of compressional waves is computed from first principles. It is shown how contrasts in material properties and heterogeneity scales translate into characteristic frequency dependencies of attenuation. The results explain the observed discrepancy of the asymptotic behavior of seismic attenuation in layered porous media with periodic and random disorder.