Source and Geophone Array Patterns arrayType extArrayType refinedArrayType refinedExtArrayType POSC 1.0 inline The sources or geophones are arranged within the seismic line. perpendicular The sources or geophones are linearly arrayed perpendicular to the seismic line. cross The sources or geophones are partly inline and partly perpendicular to the seismic line. diamond The sources or geophones form a quadrilateral with the seimsic line running along the diagonal. crows foot The sources or geophones consist of three lines. One is in-line, and the other two branch off at approximately 60 degrees from the end of the first line. x-array The sources or geophones form two lines, each oblique to the seismic line, and the seismic line forming an axis of symmetry of the x-array. odd arm star There are an odd number of lines or sources and geophones, one being in-line, and the others forming equal angles. For example, a 3 arm star would have the lines at 120 degrees each. herringbone The sources or geophones form many lines, each being oblique at a common angle to the seismic line, but being on opposite sides of the line. The several lines have no points in common. rectangular Several lines of sources or geophones that form a rectangle, with one side parallel to the seismic line.