The COCORP truck caravan moving west to east across Coshocton County, Ohio. The Vibroseis trucks served as the source of the ground vibrations. Multiple trucks were used to increase the energy injected into the ground. Shown here is the geophone connection to the instrument recording truck used elsewhere to record the signals after they returned to the surface. The photograph was taken by Michael C. Hansen in October 1987. The location is approximate to an area in southern Coshocton County where the seismic line was produced. In the autumn of 1987, the Consortium for Continental Reflection Profiling (COCORP), based at Cornell University in Ithaca, New York, conducted a National Science Foundation funded seismic-reflection profile across [...]