expanding spread
expanding spread In seismic refraction shooting, a method in which a spread of geophones is used at increased offset for repeated shots at the same location. This is equivalent to using many spreads of geophones for a single shot. In seismic-reflection surveys it is used to provide information about root-mean-square velocities and depths to reflectors using the T2−X2 method. See also ELECTRICAL SOUNDING.
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Spread , spread / spred/ • v. (past and past part. spread ) 1. [tr.] open out (something) so as to extend its surface area, width, or length: I spread a towel… Sprawl , sprawl / sprôl/ • v. [intr.] sit, lie, or fall with one's arms and legs spread out in an ungainly or awkward way: the door shot open, sending him spr… Filter Route , filter route A term introduced by the American palaeontologist G. G.Simpson in 1940 to describe a faunal migration route across which the spread of s… Stratus , stratus •cactus • saltus • Diophantus • Sanctus •Rastus, Theophrastus •altostratus, cirrostratus, nimbostratus, stratus •conspectus, prospectus •mome… Typhus , Typhus
Typhus (TI-fus) is a group of infections caused by bacteria called rickettsiae that are spread by parasites such as lice that live on people o… stratiformis , stratiformis From the Latin stratus, meaning ‘flattened’ or ‘spread out’ and forma, meaning ‘appearance’, the name of a species of cloud consisting o…
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expanding spread