fan shooting
fan shooting A simple seismic refraction method used for delineating subsurface geologic features (e.g. salt domes, buried valleys, and back-filled mineshafts) by contrasting their seismic velocities with those of the surrounding materials. Geophones are set out around a segment of arc in a fanlikearray centred on one or more shot locations. A base line of geophones is used in relation to one of the shot locations to provide a time—distance curve where no subsurface feature is present, thus calibrating the travel times for a given range. Using the fan arrays, travel times of refracted rays are measured to each detector; any ray encountering a zone of anomalously high or low velocity will arrive ahead of or behind the expected travel time for that shot-to-geophone range.
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Fan , fan
fan1 / fan/ • n. 1. an apparatus with rotating blades that creates a current of air for cooling or ventilation. 2. a device, typically folding an… Fans , Fans
Though already used for many centuries in other parts of the world, fans started becoming popular in Europe in the late sixteenth century, but e… Alluvial Fan , Skip to main content
alluvial fan FANNY , fanny •Annie, ca'canny, canny, cranny, Danny, fanny, granny, nanny, tranny •Ariadne, Evadne •daphne •Agni, Cagney •acne, Arachne, hackney •hootenanny… sea fan , deep-sea fan Fan-shaped body of sediment that accumulates at the lower end of a submarine canyon, either at the foot of the continental slope or on t… Gamma-ray Astronomy , Gamma-ray Astronomy
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Gamma-ray astronomy is the study of gamma rays within the universe. Beginning in the 1940s and 1950s astronomers and ot…
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fan shooting