Seismic Reflection

sismique
©TOTAL - GLADIEU STEPHAN

Ground waves (vibrations) caused by an explosion or weight drop are sent from a transmitter. These vibrations travel in all directions. When they reach a geological layer, some of the waves are reflected (as a mirror reflects light waves) back to the surface, while others are refracted and continue to go deeper into the ground. Analyzing the reflected waves is a way of building up an image of the subsurface.