Why do few earthquakes happen at earths mantle?

Few earthquakes occur in the Earth's mantle because the mantle is primarily composed of solid rock that behaves plastically over long periods, allowing it to deform without breaking. Most earthquakes are concentrated in the crust, where stress builds up in brittle rock layers and is released suddenly. Additionally, the mantle's depth and high temperatures create conditions that prevent the rapid release of energy associated with seismic events. As a result, the majority of seismic activity is limited to the Earth's crust.