Your comment prompted me to go read about epicenters and I learned something new. The hypocenter of an earthquake is apparently the point of origin of the earthquake and the epicenter is the point on the earth's surface directly above the hypocenter. Had never heard of a hypocenter before.
Interestingly, I learned the word hypocenter in Japan as well, in a much more sobering way. The atom bomb that hit Hiroshima exploded above the ground, and the building directly under that, where the blast would have hit first, is called the hypocenter.
I didn't know about hypocenter before too but it's neat how you can sometimes deduce the meaning of a word from its parts (because "hypo" means "under"/"below" in Greek, like in hypodermic, hypoglycaemia, etc).