S-waves, secondary waves, or shear waves (sometimes called an elastic S-wave) are a type of elastic wave, and are 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. The wave moves through elastic media, and the main restoring force comes from shear effects. These waves do not diverge, and they obey the continuity equation for incompressible media:
Its name, S for secondary, comes from the fact that it is the second direct arrival on an earthquake seismogram, after the compressional primary wave, or P-wave, because S-waves travel slower in rock. Unlike the P-wave, the S-wave cannot travel through the molten outer core of the Earth, and this causes a shadow zone for S-waves opposite to where they originate. They can still appear in the solid inner core: when a P-wave strikes the boundary of molten and solid cores, S-waves will then propagate in the solid medium. And when the S-waves hit the boundary again they will in turn create P-waves. This property allows seismologists to determine the nature of the inner core.
See saw - up and down - around and round we go Too late - we're out on the brink Our love's in the sink - washed up And when I'm walking down a rainy street I think I hear you calling out to me But it's just an echo I've arranged to meet Free fall - we're out of control - We never will know what went wrong Too bad - what we had for a while Has gone out of style this year Your friends told me you moved out of town I got your address and I wrote it down I used the pen that you bought for my birthday And every stroke, you know, reminded me of you I realize that we'll never be together again Wait a while - reclaim your loss But it costs alot - you'll learn Take five - it heals in time You'll feel just fine - they say But I feel it See saw - in a way I'm glad Though I still feel sad about you I know it's too late for changing minds And I'm still not sure I want to change mine It's just a tiny part that says that this ain't right See saw - up and down - around and round They say it heals in time - they say you'll feel just fine In a way I'm glad - Though I still feel sad about losing you
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The Brunswick News
19 Jan 2025
The Brunswick News
19 Jan 2025