Earthquakes are primarily a geological phenomenon. They occur due to the movement of the Earth's tectonic plates beneath the surface, which causes stress and strain along faults. When this stress exceeds the strength of rocks, it releases energy in the form of seismic waves, resulting in an earthquake. This process is studied within the field of geology, particularly in seismology, which focuses on understanding Earth's internal structure and the dynamics of plate movements.
While earthquakes have geographical implications—such as affecting specific regions, landscapes, and human settlements—their origin and causes are rooted in geological processes. Geography can help map earthquake-prone areas and assess risks, but the fundamental understanding of why earthquakes happen is a geological matter.