Seismic tomography is a geophysical imaging technique used to create detailed images of the Earth's interior structure by analyzing seismic waves produced by earthquakes or artificially generated sources. It involves studying the propagation of seismic waves through the Earth and using the data collected to create three-dimensional models of subsurface structures such as the crust, mantle, and core. Seismic tomography has applications in a wide range of fields including earthquake monitoring, mineral exploration, and understanding the dynamics of plate tectonics.