Seismic tomography is a geophysical technique used to image the Earth's interior by analyzing the propagation of seismic waves generated by earthquakes or artificial sources. It is akin to the medical imaging technique of CT (computed tomography), where cross-sectional images of the body are created. In seismic tomography, seismologists collect data from various seismic stations that detect waves produced by seismic events. These waves can be divided into two main types: primary waves (P-waves) and secondary waves (S-waves).
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