Attenuation of Rayleigh waves in a layered half-space with a porous layer

作者：Yan ShouGuo^*; Xie FuLi; Zhang BiXing

来源：Acta Geophysica Sinica, 2018, 61(2): 781-791.

DOI：10.6038/cjg2018K0600

• Porous media
• Layered model
• Rayleigh wave
• Attenuation characteristics

We study the propagation and attenuation characteristics of Rayleigh waves in a layered half-space with a porous layer based on the numerical simulation. Considering the excitation characteristics, we determine the main attenuation curve of Rayleigh waves and analyze its features. Focusing on two kinds of typical geological models, i.e. velocity-increase and low velocity-layer, we analyze the attenuation of Rayleigh waves in each model. The results show that the main attenuation curves of Rayleigh waves are influenced significantly by the location of the porous layer, while there is obvious relationship between the wavelength corresponding to the maximum attenuation coefficient and the thickness of the surface layer of the model. Hence the thickness of the surface layer should be rapidly computed in terms of this relationship. Besides, comparison shows that the main attenuation curve of Rayleigh waves is more sensitive to the changes of porosity and permeability of the porous medium, which means that theoretically the attenuation is more suitable to inversion for parameters. Therefore, the main attenuation curve contains more information of parameters of media. By using the attenuation characteristics the accuracy and applicability of Rayleigh wave exploration can be improved notably.

• 出版日期2018-2
• 单位中国科学院声学研究所; 声场声信息国家重点实验室