Vibroseis truck used to map the subsurface of the Earth.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...k_fullsize.jpg
Previously:
Earthquake detection kit - GIF
Ancient Chinese seismoscope - photos
Giant geotechnical drilling rig on treads - photo
Drilling rig derrick installation - photo
Friction welding drill pipe for oil exploration
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