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After news of the attack, Satoshi’s mother rushed to Hiroshima to search for her family, who lived half a mile from the hypocenter, where the A-bomb exploded.

The point in the Earth where the energy is first released is called the hypocenter, said Nate Onderdonk, professor of geological sciences at Cal State Long Beach.

An epicenter, then, is the point at the Earth’s surface above the hypocenter.

Only eight of those 20 had the other constraints Kearse and Kaneko needed to test their model, like the earthquake’s hypocenter.

Rather, the slip between rocks begins at one spot on the face of the fault—the hypocenter—and travels along it, like a zipper being unzipped.