Seismic imaging is a technique used in geophysics to create detailed images of the Earth's subsurface by analyzing the reflection and refraction of seismic waves. This technology is commonly used in the oil and gas industry to locate and characterize underground oil and gas reservoirs, but it is also used in other fields such as earthquake studies, environmental monitoring, and civil engineering. Seismic imaging involves sending controlled seismic waves into the ground and recording the reflections and refractions that occur as they pass through different rock layers. By analyzing these data, geophysicists can create 3D images of the Earth's subsurface, providing valuable information about the geology, structure, and composition of the area being studied.