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Earthquakes generate elastic waves when one block of material slides against another; the break between the two blocks being called a fault. Explosions generate elastic waves by an impulsive change in volume in the material. Small explosive charges are used in controlled-source seismic experiments in which the waves penetrate only a few kilometres into the earth.

— David Gubbins Seismology and Plate Tectonics (1990)

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Quote text and notes from Wikiquote: David Gubbins (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.