Seismic imaging is a technique used to visualize the Earth's subsurface by analyzing the waves generated by seismic sources, such as earthquakes or artificial explosions. These waves travel through different layers of rock and soil, reflecting and refracting as they encounter various materials. By measuring the time it takes for these waves to return to the surface, scientists can create detailed images of the underground structures. This method is widely used in fields like geology, oil and gas exploration, and civil engineering. It helps identify resources, assess geological hazards, and inform construction projects by providing crucial information about what lies beneath the surface.