The role of the moon, if any, may be more of a "last straw" than as a "caus= e". The cause is certainly built up stress over time from plate movement.= =20 Think of the dark spots you see on the highway. They always signal a bump = in the road. That drop of oil hung there for a while, but the bounce trigg= ers falling of drops here more than elsewhere on the road.=20 Drops still fall randomly elsewhere, but you don't much notice them except = as a darkening toward the center of the lane. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .