Early Two-Ship Marine Seismic Refraction Profiles

seismic refraction profile

Above is a set of seismograms recorded on paper from the first ever two-ship seismic refraction experiment, which was led by Maurice Ewing in the spring of 1949 aboard the Navy research vessels Atlantis and Caryn offshore of Bermuda. According to Ewing et al. (1949), they used 300 lbs of explosives for seismic sources, and the whole experiment took only 11 hours. The seismic receiver was a hydrophone floated at a depth of 50 feet in the water and a distance of 100 feet from the ship Caryn. Ewing wrote that the profile was “the most complete refraction profile beyond the continental margins known to us.”

Ewing, Maurice, Worzel, J. L., Hersey, J. B., Press, Frank, and Hamilton, G. R., 1949, Seismic refraction measurements in the Atlantic Ocean basin (Part one), Bulletin of the Seismological Society of America, v. 40, 233-242.