detected along a series of measuring points or channels 2 along the seismic streamer the vertical axis indicates the time of detection and variation in time is indicated by the arrow the horizontal axis shows different measuring points or channels their distance from the source increasing from the left to the right hand side it will appear that reflection signals 1 from a certain reflector arrive at later times with increasing distance from the source signals 3 originate from another simultaneously performed seismic survey and constitute the seismic interference it will appear that this interference masks the reflections occurring in one 39 s own survey it will also appear that the interference which is due to another source not one 39 s own occurs with a different variation of time from that of one 39 s own reflection signals on various channels in fig2 the horizontal axis indicates a space dimension representing the survey profile here separate shots 5 6 7 are separated in space and time along said profile and the reflected wave is received at measuring points or channels 5 39 6 39 7 39 which are provided at determined mutual intervals in the seismic streamer numeral 8 designates cmp or the common reflection point of various shots in the measuring series obviously the detection time of the the reflection signal depends on the two way travel time between the point of the shot and the measuring point shot 5.