Here's why:

* Earthquakes are caused by tectonic plate movement: Earthquakes are primarily caused by the movement of Earth's tectonic plates. These plates constantly shift and interact, building up stress along their boundaries. When this stress is released suddenly, it causes the ground to shake.

* Solar energy doesn't directly influence plate tectonics: While the sun's energy drives weather patterns and climate, it doesn't have a significant impact on the forces that move tectonic plates. These forces are driven by the heat within Earth's core and mantle.

However, there is a small, indirect link between solar activity and earthquakes:

* Solar flares and geomagnetic storms: These events can temporarily disrupt Earth's magnetic field. While this disruption is not strong enough to directly cause earthquakes, it might influence the flow of electrical currents in Earth's crust, potentially triggering minor earthquakes.

In conclusion, while solar energy might have a negligible indirect influence on earthquakes, the primary cause of earthquakes is tectonic plate movement, which is driven by Earth's internal heat.