Rollalong Switches
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Rollalong Switches What is a rollalong switch? Reflection surveys are conducted by moving the energy source and geophones a short distance along the ground, firing shots, and collecting overlapping sets of data. The process continues linearly until the area of interest is covered. For seismic surveys: shallow reflection, refraction, and MASW Systems for 24 or 48-channel seismographs Compact and lightweight Geostuff is the world’s leading manufacturer of rollalong switches for reflection, refraction, and MASW surveys. Models are available to match 24 or 48-channel seismographs. All models are comparatively lightweight, compact, economical, and easy-to-use. Model RS-96/24, for 24-channel seismographs, can accept inputs from up to 96 geophone stations. Model RS-120/48, for 48-channel seismographs, can accept inputs from up to 120 geophone stations. An adjustable gap accommodates splitspread surveys. This laborious procedure is made efficient by placing a larger number of geophones on the ground connected through a rollalong switch to the seismograph. The switch electrically selects groups of geophones, eliminating the need to physically move them each time.

Cables and geophones Rollalong surveys require special cables, or combinations of ordinary cables. Shown here is the most popular configuration for surveys with a 24-channel seismograph and an RS-96/24 rollalong switch. In this case, there are 48 geophones planted in the ground. The geophones are connected to four standard, 12-takeout refraction cables. Usually the user will have at least two already. The four cables are laid out in a line, with the rollalong switch and seismograph placed at the center. Because the two outward cables are some distance from the instrument, extension cables...