Seismic testing

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-	Workers clear the vegetation and mulch down 4 ft. wide paths in a grid pattern throughout woods being surveyed. Microphones are then connected to bright orange cables along the paths. Vibrator units mounted on buggies emit sound waves that go approximately five miles down into the ground. These waves reflect back off of underground rock formations, and are picked up by the microphones. This seismic data is studied in order to decide where to drill.</blockquote>	+	Workers clear the vegetation and mulch down 4 ft. wide paths in a grid pattern throughout woods being surveyed. Microphones are then connected to bright orange cables along the paths. Vibrator units mounted on buggies emit sound waves that go approximately five miles down into the ground. These waves reflect back off of underground rock formations, and are picked up by the microphones. This seismic data produced is then studied in order to decide where to drill.</blockquote>

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Revision as of 22:56, 5 October 2008

Seismic testing is a technology used to search for pockets of natural gas. High tech trucks that hunt along rural roads of Appalachia can shoot seismic waves into the surrounding ground in order to discover geologic formations under fields, farms and homes.

A typical seismic survey in a forest preserve was described this way:

Workers clear the vegetation and mulch down 4 ft. wide paths in a grid pattern throughout woods being surveyed. Microphones are then connected to bright orange cables along the paths. Vibrator units mounted on buggies emit sound waves that go approximately five miles down into the ground. These waves reflect back off of underground rock formations, and are picked up by the microphones. This seismic data produced is then studied in order to decide where to drill.