How does seismic testing work?

Answer

Seismic testing works by using a survey that's conducted by with a seismic wave on the surface of the ground along a prearranged line. The seismic wave travels into the earth, and is reflected by subsurface formations, and returns to the surface where it is noted by receivers called geophones. The seismic waves are created either by small explosive charges set off in shallow holes or by large vehicles. A geophysicist can map subsurface creations and anomalies and forecast where oil or gas is after studying the time it takes for the seismic waves to reflect off of subsurface.
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