Reflection seismology is a geophysical technique used to map subsurface structures by recording the reflections of seismic waves that are generated by an energy source, such as dynamite or an air gun. The reflected waves are recorded by a series of receivers, which are placed in a line along the surface of the earth. The data collected is then used to create a three-dimensional image of the subsurface. Reflection seismology is used to explore for oil and gas, to map geological structures, and to study the Earth's interior.