Editing Reflection seismology (section)

===The reflection experiment===
The general principle of seismic reflection is to send [[elastic waves]] (using an energy source such as [[dynamite]] [[explosion]] or [[Vibroseis]]) into the Earth, where each layer within the Earth reflects a portion of the wave's energy back and allows the rest to refract through. These reflected energy waves are recorded over a predetermined time period (called the record length) by receivers that detect the motion of the ground in which they are placed.  On land, the typical receiver used is a small, portable instrument known as a [[geophone]], which converts [[ground motion]] into an [[analog signal|analogue]] electrical signal. In water, [[hydrophone]]s are used, which convert pressure changes into electrical signals.  Each receiver's response to a single shot is known as a “trace” and is recorded onto a [[data storage device]], then the shot location is moved along and the process is repeated.  Typically, the recorded signals are subjected to significant amounts of [[signal processing]].<ref name=rs/>{{rp|2-3,21}}