Translations:Reflection seismology/6/en

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Reflection seismology is a remote-imaging method used in petroleum exploration. The seismic reflection method was developed in the 1920s. From then until about 1965, the method involved two steps: acquisition and interpretation. Acquisition consisted of setting off a dynamite explosion in the ground and using geophones planted in the ground to detect the resulting seismic waves. The geophones were laid out on a line. The received waves were recorded on photographic paper on a drum. The recordings were taken for a time span of about two or three seconds after the moment of the shot. Each receiver accounted for a single wiggly line, which is called a seismic trace or simply a trace. In other words, a seismic trace is a signal originating from a specific source location and received at a specific receiver location. In the early days, a seismic crew could fire approximately ten shots a day, with a dozen or so receivers for each shot. Each shot yielded an analog seismic record made up of traces, with one trace from each receiver used (Figure 1).