Changes

==Midpoints==

==Midpoints==

To transmit energy into the subsurface, a shot is fired on the earth's surface. Many seismic receivers record the resulting echoes from underlying strata. Each receiver records the echoes in a [[trace]] called a '''[[prestack trace]]'''. Each prestack trace has a source and receiver coordinate, but the trace is plotted at the point halfway between the source and receiver pair, called the midpoint. The seismic method is designed so several prestack traces have the same midpoint.  For more information about acquisition, please see [[Seismic data acquisition on land]] and [[Marine seismic data acquisition]].

To transmit energy into the subsurface, a shot is fired on the earth's surface. Many seismic receivers record the resulting echoes from underlying strata. Each receiver records the echoes in a [[trace]] called a '''[[prestack trace]]'''. Each prestack trace has a source and receiver coordinate, but the trace is plotted at the point halfway between the source and receiver pair, called the midpoint. The seismic method is designed so several prestack traces have the same midpoint.  (For more information about acquisition, please see [[Seismic data acquisition on land]] and [[Marine seismic data acquisition]].)

==Bins==

==Bins==