De toute façon, nous conseillons vivement de réaliser une pré-interprétation minute sur le site dés la réalisation du PREMIER TIR, ceci afin de vérifier que la valeur des vitesses de fond
correspond bien à l'objectif recherché, car il arrive parfois que les vitesses intermédiaires soient si proches les unes des autres que les angles de réfraction limite atteignent des valeurs telles que l'on se retrouve avec des distances critiques particulièrement élevées.

http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=...

Land Data Acquisition:
In land acquisition, a shot is fired (i.e., energy istransmitted) and reflections from the boundaries of various Lithological units within the sub-surface are recorded at a number of fixed receiver stations on the surface. These geophonestations are usually in-line although the shot source may not be.

http://www.scribd.com/doc/7256110/2D-and-3D-Land-Seismic-Dat...

le procédé étant caractérisé par :(a) la fourniture (1330) d'une série de signaux de base de tir sismique presque identiques à partir d'un site fixé (410), ladite série ayant au moins un premier et un second tir sismique ;(b) la réception (810, 835) desdits premier et second signaux de base de tir sismique dans une unité d'acquisition de données sismiques éloignée dudit site fixé ;

a first and second seismic shot;(b) receiving (810, 835) said first and second seismic shot signal trains at a seismic data acquisition unit remote from said fixed site;

http://www.linguee.fr/anglais-francais/traduction/2-d seismi...

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Note added at 12 hrs (2014-06-07 11:00:48 GMT)
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These data represent the FIRST SHOT point for
each LINE of data acquired with various SEISMIC-REFLECTION systems utilized during
U.S. Geological Survey geophysical research cruises.

http://pubs.usgs.gov/of/2003/of03-150/arcview/shape/tracks/c...




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Note added at 12 hrs (2014-06-07 11:13:56 GMT)
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Bonne explication du terme ''seismic shot'' ici:

In MARINE SURVEYS where it is the seabed which has to be surveyed, a typical seismic tow will consist of one or more sources and one or more cables, also called streamers. The actual towing is performed by one or more vessels. The seismic equipment towed behind the vessels is usually submerged in the water, the sources at a depth of roughly 5 to 10 metres, and the streamers at roughly 5 to 30 metres. A streamer generally extends to a length of from a few hundred metres to several thousand metres, although a length of 3,000 metres is usual. Inside the streamer which has a diameter of approximately 6 centimetres there are located a large number of sensors, also called hydrophones. A source usually consists of several suitable SONIC GUNS, e.g. AIRGUNS which are arranged in a row or in a group. This is also called a GUN array. A gun array is normally from 10 to 30 metres in length. When airguns are used, the guns are filled with compressed air, this air being released at a given time, thereby forming the seismic pulse. This is also called a SEISMIC SHOT or a shotpoint. It is this pulse which, after having been reflected, is intercepted by sensors in the seismic streamer. In a streamer of approximately 3,000 metres there can be from several hundred to over a thousand groups consisting of one or more sensors. This means that the groups are situated close to one another. The normal procedure is to record data concerning the ground formation every 25 metres, and with a density in the tow's width direction of from 50 to 200 metres. The signals received by the hydrophones are transmitted analogically or digitally to a receiver station via the streamer's system of transmission lines. In the receiver system the signals are processed in the desired manner. The processing of data is performed by means of a computer PROGRAMME and algorithms suited to the purpose.

http://www.google.com/patents/EP0680615B1?cl=en