Reflection seismology is a method used to investigate the properties of Earth's subsurface. There are various synonyms used for reflection seismology, including seismic reflection, seismic reflection survey, and seismic imaging. Seismic imaging is a term that refers to the use of seismic waves to create images of the subsurface. Seismic reflection survey is a process of recording and analyzing the reflections of seismic waves to determine the subsurface features. Seismic reflection is the echo produced when a seismic wave encounters an interface between two different materials within the subsurface. All of these terms describe different aspects of the same technique used to investigate the structure of the subsurface.