What is a major geological event that occurs when plates shift suddenly and release stored energy?

A major geological event that occurs when tectonic plates shift suddenly and release stored energy is an earthquake. This release of energy typically happens along fault lines, where stress has accumulated over time due to the movement of the plates. The sudden movement generates seismic waves, which can cause significant ground shaking and damage to structures. Earthquakes can vary in magnitude and impact, depending on the amount of energy released and the depth at which they occur.