La sismique par réflexion est basée sur la mesure des temps de trajet A/R des ondes sismiques transmises par la surface et réfléchies vers la surface par les interfaces entre horizons géologiques ayant des caractéristiques différentes.
La réflexion de l’énergie transmise se fait uniquement lorsqu'il y a un contraste d’impédance acoustique (le produit de la vitesse x la densité du matériau) entre deux couches superposées. L’entité du contraste d’impédance acoustique entre deux couches détermine l’amplitude du signal réfléchi, qui est relevé en surface en utilisant une application de géophones à haute fréquence (40 Hz, 100 Hz). Comme dans le cas de la sismique à réfraction, l'énergie est produit par un « éclatement » ou « impact » en surface. À la masse de butée, il faut préférer en règle générale une masse battante, un énergisateur pour sismique ou (si possible) une charge explosive.
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