The reality is that I caused the earthquake. After eating one too many bean burritos deep in my sub-sea lair, the gaseous buildup coupled with my electrical spines resulted in an explosion so great that it shook the world. In fact, even I... The great GoGoGodzilla was knocked unconscious from the explosive blast.
But never fear, I will soon rise to visit Japan and eat all the radioactivity from the crippled reactors. Never say that I'm just a destructive beast that likes to stomp Tokyo flat... for I'm also a beast that, in times of need, will come to help save Japan.
Go Go Godzilla!