Photo glossary of earthquake terms
Ripples on a pond are attenuated as they move away from the
source. (Photo by Beth Conant)
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Attenuation
When you throw
a pebble in a pond, it makes waves on the surface that move
out from the place where the pebble entered the water. The
waves are largest where they are formed and gradually get
smaller as they move away. This decrease in size, or amplitude,
of the waves is called attenuation. Seismic waves
also become attenuated as they move away from the earthquake
source.
Q
Q is the inverse
of attenuation. A high Q means a low attenuation.
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