The source generates a mechanical disturbance which propagates in the ground, is re-
ected, refracted or diracted, and returns to the surface. When the disturbance propagates
in a
uid such as water a temporary variation of pressure is created. Elastic
deformation results in movements of the surface and at some point of the surface the
acceleration, the velocity or the displacement of a point can be measured. In any case,
whether a movement or a variation of pressure is observed, we have to represent it by
some other physical quantity which can be easily stored and manipulated. Considering
the development of electronic technology, a representation by an electrical voltage is evidently
a good solution. The rst eld component of a seismic data acquisition system is
the detector group. The detectors convert the seismic disturbance into a voltage of which
the variations represent faithfully the variations of the mechanical disturbance detected,
a voltage which is the analog of the seismic disturbance.
The source generates a mechanical disturbance which propagates in the ground, is re-ected, refracted or di racted, and returns to the surface. When the disturbance propagatesin a uid such as water a temporary variation of pressure is created. Elasticdeformation results in movements of the surface and at some point of the surface theacceleration, the velocity or the displacement of a point can be measured. In any case,whether a movement or a variation of pressure is observed, we have to represent it bysome other physical quantity which can be easily stored and manipulated. Consideringthe development of electronic technology, a representation by an electrical voltage is evidentlya good solution. The rst eld component of a seismic data acquisition system isthe detector group. The detectors convert the seismic disturbance into a voltage of whichthe variations represent faithfully the variations of the mechanical disturbance detected,a voltage which is the analog of the seismic disturbance.
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