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首页> 外文会议>4th European Conference on Underwater Acoustics Vol.1, Sep 21-25, 1998, Rome, Italy >PROPAGATION OF STONELEY WAVES ALONG A SEDIMENT / ROCKY BOTTOM 'NON-IDEAL' INTERFACE. APPLICATION TO MARINE GEOPHYSICS
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PROPAGATION OF STONELEY WAVES ALONG A SEDIMENT / ROCKY BOTTOM 'NON-IDEAL' INTERFACE. APPLICATION TO MARINE GEOPHYSICS

机译：沉积物/岩石底部“非理想”界面上的石质波传播。在海洋地球物理中的应用

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摘要

In most layered-medium problems in acoustics or in geophysics boundary conditions are generally taken as those of perfectly bonded interfaces, which is a reasonable first approach for many situations. However an actual interface between two solids is much more complicated and may have physical properties different from those of the elastic media in contact. For instance, microcavities at the interface, resulting from tectonics or erosion processes and filled up with fluid or solid, may affect the state of boundary conditions and thus elastic wave reflection and interface wave propagation. This is specially the case if the microcavity thicknesses, assumed to be small compared to the incident wavelength, are of the same size than the characteristics of the particle displacement associated with the exciting wave. Neglecting such interface imperfections may then lead to erroneous interpretation of seimic events. In this paper, attention is focused on the propagation of interface waves along a non-ideal boundary between two solids. The interface is assumed to be a periodic combination of welded contacts and disbonding zones between elastic media. Such an interface is generally described by boundary displacement discontinuity models in Non Destructive Testing (NDT) of composite materials. We propose to examine the propagation of Stoneley and generalized Rayleigh waves within such imperfect interface models.
机译：在大多数层状介质中，通常将声学或地球物理中的边界条件问题视为完美粘结的界面问题，这是在许多情况下的合理第一种方法。但是，两个固体之间的实际界面要复杂得多，并且可能具有与接触的弹性介质不同的物理特性。例如，由于构造或侵蚀过程而产生并充满了流体或固体的界面处的微腔可能会影响边界条件的状态，从而影响弹性波的反射和界面波的传播。如果微腔厚度（假定与入射波长相比较小）的尺寸与与激发波相关的粒子位移的特征尺寸相同，则尤其如此。忽略这样的界面缺陷可能会导致对地震事件的错误解释。在本文中，注意力集中在界面波沿两个固体之间的非理想边界的传播上。假定该界面是弹性介质之间焊接触点和脱胶区域的周期性组合。通常通过复合材料的无损检测（NDT）中的边界位移不连续模型来描述这种界面。我们建议在这种不完善的界面模型中检查斯通利波和广义瑞利波的传播。

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