A type of
seismic wave, the S-wave, secondary wave, or shear wave, sometimes called an elastic S-wave, is one of the two main types of elastic
body waves, so named because they move through the body of an object, unlike
surface waves.The S-wave moves as a shear or
transverse wave, so motion is perpendicular to the direction of wave propagation: S-shaped, like waves in a rope, as opposed to waves moving through a slinky, the
P-wave. The wave moves through elastic mediums, and the main restoring force comes from shear effects. These waves are divergenceless and obey the continuity equation for incompressible media.
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S波（S-wave or secondary wave）是二種體波（體波的命名是因為此波穿越
地球內部，相對於體波的是表面波）中之一。它是因
地震而產生的，被
地震儀記錄下來。命名為S波（secondary wave）是因為它的速度僅次於
P波（最快的
地震波）。S波的S也可以代表剪力波(shear wave)，因為S波是一種橫波，地球內部粒子的震動方向與震波能量傳遞方向是
垂直的。S波與P波不同的是，S波無法穿越外
地核。所以S波的陰影區正對著地震的
震源。
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