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本研究利用超声波水槽模拟来检验当地震能量即使被一简单3D界面构造绕射干涉时也会产生的复杂性。超声波实验模拟是在室内的水槽中用一铝块模拟很简单的洋底地形做出的。地形由平行凹陷组成,它模拟平行于洋中扩张脊的谷地。研究表明,一次洋底反射波的相位及振幅可随着传播方位而强烈变化。尾波能量作为传播方向的一个函数也急剧变化,显示出研究包括界面构造的全三维方位分布的一个地震模型的重要性。
The present study used ultrasonic bath simulations to examine the complexities that occur when the seismic energy is diffracted by a simple 3D interface. Ultrasound experiments were performed using an aluminum block simulating a very simple ocean bottom terrain in an indoor sink. The terrain consists of parallel depressions that mimic the valleys parallel to the mid-ocean dilation ridge. The study shows that the phase and amplitude of an ocean bottom reflected wave can change strongly with the propagation direction. A sharp shift in coda energy as a function of propagation direction shows the importance of studying a seismic model that includes full three-dimensional azimuthal distribution of interface configurations.