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					Originally Posted by MsTinkerbelly  Because there is no warning and you have no control, it is sometimes like being in a bombing or other violent episode; the effects to your system might hang on a while. Just talk about it to all who will listen...share your feelings and concerns. It really does help when you feel like you're not so alone. | 
	
 Yes, the unexpectedness makes it hard to process.
I think, too, that it's a primal fear:  the actual ground on which you're standing is moving. It literally "shakes the foundation" of your existence. 
It's "deeper" than storms or floods and such. In a tornado, you go inside. In a flood, you get to higher ground. In an earthquake? They say if you're inside stay inside; if you're outside stay outside. What's that tell you? There is nowhere safe to go.