weight drop

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A seismic-energy impulse produced when a heavy weight is allowed to fall and strike the ground. Weights vary from a few kilograms dropped from 2–3 m, for shallow seismic-reflection surveys, up to several tonnes dropped from 3–4 m, in large-scale, commercial, seismic-reflection surveys. In an accelerated weight drop, a mass (usually of no more than a few tens of kilograms) is accelerated towards the ground by compressed air, thus increasing the impact force and energy impulse. See also hammer; and shot.

Subjects: Earth Sciences and Geography.

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