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本文引用超声波地震模拟实验的结果讨论了弯曲界面上折射法地震记录的特征。实验结果指出,当折射界面位于一定的深度时,时距曲线上总会出现由于界面弯曲所形成的“线圈”。而波在“线圈”上各点的强度根据曲面的几何形状而变化。当界面的曲率为零时,“线圈”成为绕射波时距曲线。 当折曲界面出现的落差较小时,使得上下棱的绕射波相迭加,“线圈”上的强度骤增,甚至达到折射波强度的5倍。从而可以根据“线圈”的动力学及运动学特征作出有关曲界面的解释。
This paper refers to the results of ultrasonic seismic simulation experiments to discuss the characteristics of refraction seismic record on curved interface. The experimental results show that when the refractive interface is at a certain depth, the “coil” due to the interface bending always appears on the time-distance curve. The intensity of each point on the “coil” varies according to the geometry of the surface. When the curvature of the interface is zero, the “coil” becomes the diffraction wave time-distance curve. When there is a small gap at the bending interface, the diffraction waves on the upper and lower edges are superposed, and the intensity on the “coil” sharply increases even up to 5 times the intensity of the refracted wave. Thus, the interpretation of the curved interface can be made based on the dynamics and kinematics of the “coil”.