The epicenter is the location on the Earth’s surface where the tremors are felt first. Since it is the point directly above the focus, the seismic waves (specifically P-waves) have the shortest distance to travel to reach this spot. Consequently, ...
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Seismology, the study of seismic waves, is the most reliable source of information regarding the Earth’s interior. As P and S waves travel through the Earth, they change speed and direction (refract) when they encounter different densities and states of ...