noun
Refers to the point on the earth's surface directly above or below an explosion, especially a nuclear one; also used metaphorically for the center of a disaster or crisis.
広島のゼロ地点には平和記念公園が造られた。
Peace Memorial Park was built at ground zero in Hiroshima.
地震のゼロ地点となった町は壊滅的な被
The town that became the earthquake's ground zero suffered catastrophic damage.