Coverage, 3

THIS SHOWS THE SEISMIC RAY PATHS A diagram representing the degree of coverage with dots and plus symbols. https://www.w3.org/1999/xlink" xlink:href="#long-desc8"/> https://www.w3.org/1999/xlink" xlink:href=" https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003761020/e10523ab-dbe3-4c4f-8f3e-863ae3683950/content/pg43_1.tif "/> Vertical section showing the SEISMIC RAY PATHS arriving at different traces of successive spreads (here the spreads are of 12 traces and shot end on). Position of the successive spreads on the surface. The first spread to be shot is the bue, then the second, coloured red, next the third, coloured green, etc… The different MIRROR POINTS may be seen and it noted that the first are covered once, the second twice and the coverage stabilises at three for the third and subsequent shots. Three fold, in this example, is the degree of coverage. The next page - detail of one of the REFLECTION POINTS with 3 fold coyer.