Seismic profiler

Equipment for recording and profiling seismic refraction, seismic reflection, and underwater sound transmission data has been developed at Lamont Geological Observatory. The detector is a piezoelectric crystal hydrophone, the amplifiers are transistorized, modeled after those normally used in seismic refraction work, and the recorder is a modified Times Facsimile drum recorder. Profiling is achieved by initiating the drum rotation with the shot-instant signal. Refraction data are displayed in the form of a standard time-distance plot, the distance scale being determined by the speed of the shooting ship and the time scale by the speed of rotation of the drum, which can be preset by proper choice of gears and electrical switching. Reflection data are recorded in section form, analogous to standard echo sounder records. A choice of full-wave or half-wave rectification is available, and logarithmic or linear amplifier response can be selected as desired.