5 TIPS FOR SURVIVING A EARTHQUAKE
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Primary are alternatingly compressional and extensional, and cause the rocks they pass through to change in volume. These wavesare the fastest traveling seismic waves and can travel through solids, liquids, and gases. Also called P wave. See Note at earthquake. Secondary cause the rocks they pass through to change in shape. These waves are the second fastest traveling seismic waves(after primary waves) and can travel through solids but not through liquids or gases. Also called shear wave , S wave. Surface a mechanical wavethat propagates along the interface between differing media, usually as a gravity wave between two fluids with different densities. A surface wave can also be an electromagnetic wave guided by a refractive index gradient.
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