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The faster a shear wave travels in the organ, the stiffer the organ is interpreted to be.

This layer appears to glide over a weaker region below called the asthenosphere, characterized by high seismic attenuation and low shear wave velocity.

In an earthquake, P waves — or compressional waves — arrive first but usually don’t cause much damage; they’re followed by the S wave, or shear wave.

Instead, it's the shear wave, aka S wave, that people usually feel during an earthquake.

The ground-up rock would absorb shear wave energy that would otherwise help propagate the rupture.