Dictionary:Uphole survey

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1. Successive sources at varying depths in a borehole in order to determine the velocities of the near-surface formations, the weathering thickness, and (sometimes) the variations of record quality with source depth; see Figure S-22. 2. A string of geophones is sometimes placed in a hole of the order of 200 ft deep to measure the vertical travel times from a nearby shallow source. See Figure U-1.