波就是振动的传播，通过介质传播。横波也称“凹凸波”，是质点的振动方向与波的传播方向垂直。纵波是质点的振动方向与传播方向平行的波。
一般地说横波速度大约是纵波速度的一半。
Normally the shear velocity is about half of the compressional velocity.
地震所引起的地面振动是一种复杂的运动，它是由纵波和横波共同作用的结果。
Caused by the earthquake ground vibration is a complex exercise, it is by the P-wave and S-wave interaction results.
提出了用低频多模式超声兰姆波定征方法来估计超薄弹性层的纵波声速、横波声速、厚度和密度等参数。
A low frequency multi mode ultrasonic Lamb wave method suitable for characterizing shear and longitudinal wave velocities, thickness and density of ultra thin elastic layers is presented.
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