Increase in natural disasters, is the world going to end?

I know this may sound silly, but it does appear that recently there has been a significant increase in 'natural' disasters in the last few years, ie. Japan tsunami, Haiti earthquake, Icelandic volcano eruption, New Zealand earthquake and currently the tornadoes in Kansas. I'm only fifteen years old, so I haven't been around long enough to know if this is normal or not. Has there really been an increase in these disasters, or is it just scare mongering? If there has been an increase, why? I'm really scared it's a sign of the apocalypse or something. Thanks for any answers...