There a scientific explanation for earthquakes. Earthquakes are usually happening when some rocks gets destroyed under earth. This is called the faulting point. It is a natural phenomena and it can be explained more in depth than the short explanation I gave. I know God or a super natural power created all universe.
Yes, earthquakes are a natural process. And if we consider this from a magical point of view, then nature is fed up with the fact that a person kills it.