Seismic Waves:
Ø During fault ruptures which cause earthquakes, the sudden breakage and movement along the fault can release enormous amounts of energy.
Ø Some of this energy is used up in cracking and pulverizing the rock as the two blocks of rock separated by the fault grind past each other.
Ø Part of the energy, however, speeds through the rock as seismic waves. These waves can travel for and cause damage at great distances. Once they start, these waves continue through the earth until their energy is used up.
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